PP1 kinerja tinggi RIAA tabung vakum bergerak modul preamplifier magnet Sirkuit ini didasarkan pada tabung vakum Audiophile prefektur Marantz 7C yang terkenal. Ini bukan rangkaian preamp standar phono Anda. Pengembangan yang ekstensif dan dukungan produk yang andal masuk ke masing-masing produk saya. Isnt tentang waktu Anda memiliki koneksi Simple terbaik. Tambahkan 285VDC dan 245VDC, pemanas 6.3V, jack input dan output dan youre dalam bisnis. Soket tabung keramik retensi tinggi mencegah agar tabung tidak terlepas dari soketnya. Pemerataan RIAA dan kualitas pembuatan yang hebat dari perakitan ini memungkinkan Anda menikmati koleksi vinil Anda dengan cara yang belum pernah Anda dengar sebelumnya. Detail yang menakjubkan, respon ultra halus dan suara klasik tabung vakum. Siapa yang bisa meminta lebih. Rangkaian ini sangat dekat dengan rangkaian phono Marantz 7C. Tentu saja ukuran fisik komponen yang tersedia untuk Marantz di tahun 50an dan 60an tidak akan membiarkan mereka membangun majelis kompak semacam itu. Papan sirkuit hanya mengukur 2quot X 6quot dan dapat dipasang pada bidang horizontal atau vertikal. Tabung yang dibutuhkan adalah 2X 12AX7 dan 1X 12AU7 (atau gunakan 3X 12AX7 seperti sirkuit aslinya). Anda bisa menjalankan pemanas di DC atau AC. Anda akan mendapatkan sedikit dengung dengan DC tentu saja. Sebenarnya, plat pelindung depan depan yang dipasang di sisi solder papan sirkuit (tidak diperlihatkan) ditambah dengan bidang tanah penuh pada sisi komponen papan akan mengurangi EMI ke keadaan tidak praktis yang praktis. CATATAN - Tabung hampa udara tidak disertakan dengan unit sirkuit ini dan hanya ditampilkan sebagai contoh pada foto ini. Papan sirkuit dibangun dari kaca siku bergradasi 1oz foil beriringan udara FR4. Semua koneksi dilapisi kedua sisi untuk retensi komponen luar biasa terlepas dari pertimbangan panas atau getaran. Penyesuaian impedansi yang mudah dilakukan dengan memindahkan shunt selektor ke posisi impedansi yang diperlukan. Anda memiliki pilihan dari 22KOhm, 47KOhm dan 100KOhm masukan impedansi posisi untuk mencocokkan preamp Anda untuk hampir semua magnet bergerak (MM) cartridge. Semua komponen telah dipilih secara khusus untuk stabilitas, toleransi ketat dan kebisingan rendah. Ini adalah rangkaian kualitas premium yang siap memberi Anda pengalaman akhir dalam kenikmatan mendengarkan phono selama bertahun-tahun yang akan datang Impedansi masukan mudah diatur ke 22KOhm, 47KOhm atau 100KOhm dengan menggerakkan jumper ke pengaturan yang diinginkan Pertimbangkan untuk memilih salah satu dari ini. Ketersediaan sangat terbatas. Kualitas membangunnya luar biasa dan hookupnya sederhana, terutama jika Anda memiliki pengalaman dengan sirkuit tabung vakum. Ini adalah unit yang dirakit penuh dan yang Anda butuhkan hanyalah sambungan daya, tabung, dan koneksi input dan output. Membuat pendamping yang sempurna untuk setiap tahap tabung amp DIY. Mulailah mendengarkan vinil Anda dan nikmati sekali lagi KURVA RESIKO RUSIA ELUSIF Kurva pemerataan RIAA yang ideal harus dipatuhi sedekat mungkin untuk memastikan kinerja tinggi yang bergerak pada phamo preamplifier. Banyak produsen peralatan solid state menggunakan desain sirkuit yang rumit untuk mematuhi standar RIAA. Desain berkisar dari sirkuit transistorisasi yang relatif sederhana hingga pemrosesan sinyal digital yang kompleks, namun desain 7C tua yang baik dari jauh ke belakang pada suhu 50an membuatnya tetap sederhana namun akurat. Desain ini benar di tempat pertama, tapi insinyur dan audiophiles sama-sama bersikeras untuk menemukan kembali kemudi dan telah melakukannya sejak tahun 1950an. Apakah itu masuk akal sama sekali Im pengikut dari quotIf itu tidak pecah, dont fix itquot sekolah pemikiran. Diagram di bawah ini mewakili kurva pemerataan formal RIAA (Recording Industry Association of America) yang ideal. Diagram berikut diagram menguraikan poin frekuensi dan karakteristik gain untuk respons RIAA ideal dan pembacaan aktual yang diambil dari modul preamp PP1 yang umum dilengkapi dengan tiga tabung vakum 12AX7 yang diukur pada penganalisis spektrum FFT Hewlett Packard 3582A. Perhatikan sedikit varians gain antara kurva pemerataan ideal dan pembacaan aktual. Sebenarnya, perbedaan yang lebih besar, atau kesalahan jika Anda inginkan, disebabkan oleh variasi antara sampel tegangan yang diambil oleh penganalisis spektrum. Tegangan masukan ke PP1 adalah white noise acak yang rata di seluruh spektrum audio. Alat analisa diatur untuk menampilkan pembacaan RMS dengan respon filter Hanning. Kurva pemerataan RIAA yang ideal Ini adalah contoh dari sinyal keluaran white noise output. Layar tertangkap pada digitizer Tektronix 7D20. PP1 dirancang dengan menggunakan alat uji rak paling atas dari Tektronix dan Hewlett Packard. Tidak ada detail yang diterima begitu saja sehingga saya dapat memberi Anda produk dengan keandalan tertinggi dengan harga yang lebih murah dengan harga murah. Saya tahu Anda akan senang dengan konstruksi, kinerja, dan kemudahan pemasangan modul input input PP1 phono. Kerja keras sudah dilakukan sebelumnya sehingga Anda tidak perlu melakukannya. Cukup pasang sirkuit, sambungkan ke catu daya Anda, tambahkan tabung, lalu gunakan waktu yang Anda simpan untuk menikmati musik Anda Layar Hewlett Packard 3582A menampilkan respons frekuensi yang diukur dari modul preamp PP1 fono. Suara putih acak diaplikasikan pada input preamp. Pengaturan tampilan penganalisis spektrum 10dB per divisi vertikal dan 2.5KHz per divisi horizontal. Frekuensi bandwidth yang ditampilkan adalah 0Hz sampai 25KHz. Total keseluruhan amplitudo diferensial hanya di bawah 40dB dengan referensi 0dB pada 1KHz seperti yang ditunjukkan oleh penanda. Perhatikan bahwa tampilan ini terlihat agak berbeda dengan kurva RIAA yang ideal diatas. Diagram pemerataan ideal didasarkan pada skala horizontal logaritmik sedangkan spektrum analyzer display adalah skala linier. Heres beberapa umpan balik baru-baru ini dari pembeli yang puas quotKen, saya mengaitkan semuanya kemarin dan sukses. Pengukuran pada beban (setelah pasokan telah berjalan setengah jam): pemanas adalah 6,32, keran 245v adalah 248 dan keran 285v berada pada 278. Amp sebelumnya dengan tabung terpasang terhubung ke stereo saya pada saat itu, dan WOW. Dipecat tepat. Saya memainkan beberapa rekaman suara kuadrat dengan piringan hitam yang sangat saya kenal dan dewan Anda lulus tes asam - bidang suara yang besar dan dalam dan saya mendengar rincian yang belum pernah terdengar sebelumnya. Dan seperti peralatan audio terbaik, karena pembakarannya pada kualitas output semakin baik. Terima kasih banyak atas bantuan Anda dan membiarkan saya menambahkan tahap phono pembunuh untuk uang dibandingkan dengan versi perbandingan pra-dibangun dari kualitas ini yang akan dijalankan. Beberapa bulan yang lalu, majalah Stereophile menjalankan peninjauan tahap phono yang sesuai dengan kutipan Anda berdasarkan Marantz 7Cquot dan menggunakan tabung yang sama. Seperti versi yang saya bangun itu juga dilengkapi dengan power supply terpisah yang berdiri sendiri. Semua dengan harga hampir 4.000 USD. DATANG SEGERA - GALERI PENGGUNA Ya, Anda akan bisa mengintip seberapa serius penggemar audio di seluruh dunia mengemas preamp PP1 mereka dan juga mendapatkan beberapa ide dan tip konstruksi. Nantikan saja. Tidak ada banyak pilihan dalam kategori ini karena perangkat step-up habis-habisan telah dilakukan oleh industri audio. Mereka berkecil hati 30 tahun yang lalu oleh majalah berpengaruh The Absolute Sound (pada saat itu). Dalam idealisme gabungan dan ketidaktahuan teknis mereka, ditunjukkan oleh Kritik Audio dan Review Audio Internasional. Mereka mempengaruhi produsen preamplifier untuk membangun preamplifiers gain tinggi. Hasil dari kampanye ini adalah unit yang jauh lebih rendah dari apa yang dapat dicapai dengan langkah maju dan tahap phono gain rendah. Hanya kombinasi itu yang bisa mempertahankan dinamika, body dan detil tingkat rendah dari sinyal aslinya. Ironisnya, ketika produsen pada akhir tahun 1990an akhirnya menciptakan preamplifier gain tinggi superior, dengan langkah internal, hampir tidak ada yang memperhatikannya. Sebenarnya, Sound Mutlak bahkan tidak pernah mengulasnya, saya menempatkan unit ini (Audion Premier Quattro) di dalam Kelas A dari bagian Preamplifier. Informasi Penting dan Perbedaan Catatan - Kartrid penggerak gulungan umumnya memiliki energi lebih banyak daripada kartrid magnet bergerak. Hal ini terutama karena magnet mereka (stasioner) lebih kuat daripada yang bergerak. Masalah yang harus diatasi adalah energi mereka terutama pada arus. Sedangkan preamplifiers terasa dan menguatkan tegangan. Ketidakcocokan ini bisa diatasi dengan menguatkan voltase kecil yang ada atau mengubah kelebihannya (dan sebaliknya tidak berguna) arus menjadi voltase lebih lama sebelum mencapai tahap phono dari preamplifier. Tahap phono kemudian menguatkan sinyal dan juga menyamakannya pada saat bersamaan, menggunakan kurva pemerataan RIAA. Moving Coil Transformers - Ini adalah perangkat pasif (tanpa catu daya) yang mengubah kelebihan arus dari kartrid kumparan bergerak menjadi tegangan. Yang kemudian bisa diperkuat (dan disamakan) oleh fono tahap (MM) dari preamplifier. Penguat Header Peluncur Kuat - Ini adalah perangkat aktif, dengan catu daya, yang memperkuat voltase kecil dari peluru kumparan yang bergerak sehingga mendekati voltase normal dari kartrid magnet yang bergerak. Tahap phono masih harus semakin menguatkan dan kemudian menyamakan sinyal. Nama lain untuk jenis perangkat aktif ini, yang juga biasa digunakan, adalah: Pre-preamplifier. Karena bersifat pasif, transformator memiliki beberapa kelebihan teoritis dibanding penguat kepala, namun eksekusi masih penting untuk kedua perangkat. Akhirnya, perangkat Step-up TIDAK tahap phono. Phono Tahapan memiliki bagian tersendiri. Catatan Penting - Tinjauan EMIASlagle di bawah ini merupakan pemikiran terakhir saya (2014). Semua posting dan ulasan yang terlihat di bawah EMIASlagle ditulis di tahun-tahun sebelumnya dan sekarang sudah usang. EMIASlagle Silver MC Step-Up Transformer EMIASlagle adalah trafo step-up yang luar biasa, satu dari tiga yang terbaik yang pernah saya dengar. Namun, saya memiliki waktu yang sangat sulit, pada awalnya, membandingkannya dengan Bent Audio Silver. Yang telah menjadi referensi pribadi saya sejak 2006. Jadi saya memutuskan untuk meminta dua rekan saya untuk membantu saya. Saya harus merasa yakin bahwa kita melakukannya dengan benar, dan bahwa kita tidak kehilangan apapun, untuk keadaan yang lebih baik atau lebih buruk. Jadi, setelah banyak perbandingan AB (paling banyak dilakukan oleh saya sendiri), dengan senang hati saya laporkan bahwa kita SEMUA telah mendengar perbedaan sonik yang sama, meskipun reaksi kita terhadap apa yang kita dengar agak berbeda. The EMIASlagle Vs The Bent Silver Perak Bent terasa lebih unggul di area yang selalu sesuai kuat. Lantai suaranya yang lebih rendah, kelezatan dan kedekatan yang lebih baik, menghasilkan rincian yang lebih baik, lebih kohesif dan memiliki fokus yang superior. EMIA juga bagus di semua area ini, tapi tetap terbaik kedua jika dibandingkan dengan Bent. EMIA memang memiliki satu keuntungan yang mudah terlihat meskipun dan, untuk audiophiles yang banyak, ini mungkin merupakan faktor yang sangat penting dan penting. EMIA memiliki reproduksi bass terbaik yang pernah didengar, dari setiap langkah MC dalam hal kekuatan, rentang frekuensi, detail dan soliditas. . Sebenarnya, karena saya merasa itu belum pernah terjadi sebelumnya (terutama untuk perak), saya mencoba setiap LP yang menantang untuk menemukan kelemahan dalam reproduksi bass EMIA, tapi saya gagal. Hanya kualitas bass Bents yang bisa menandingi EMIA, tapi tidak ada yang lain. Selanjutnya, ukuran gambar EMIA juga luar biasa, sedikit lebih besar dari pada Bent, meski dengan mengorbankan beberapa fokus. Tiga reaksi kita semua bervariasi saat mendengar perbedaan sonik ini. Rekan pertamaku (yang memiliki preferensi musik paling konvensional) agak terbelah di antara mereka, lebih dulu memilih satu SUT, lalu SUT lainnya, tergantung musiknya. Rekan kedua saya lebih menyukai periode Bent. Dalam semua kasus, merasakannya secara harfiah, dengan kata-katanya sendiri, di kelas lain. Reaksi saya berbeda, meski pastinya lebih dekat dengan rekan kedua saya juga, tanpa pertanyaan, lebih memilih Bent secara keseluruhan. Namun saya menyadari bahwa EMIA mungkin lebih memuaskan dengan rekaman tertentu (terutama non-klasik). Lebih jauh lagi, saya memberi bobot kedua untuk dua alasan pertama, selera musiknya lebih dekat dengan saya (berorientasi klasik, tidak seperti rekan pertama), dan kedua, dia mendengar Bent terbaik, tidak seperti rekan pertama (lihat Another Bukti di bawah), yang hanya mendengar EMIA yang terbaik. Yang pertama relevan untuk dicatat bahwa Bent Silver sekarang telah lama dihentikan (dan hampir tidak mungkin ditemukan). Ini berarti bahwa EMIASlagle mungkin adalah SUT terbaik yang saya tahu tentang hal itu sebenarnya sedang dibangun dan tersedia saat ini. Hanya ada satu pesaing serius yang saya kenal, Coincident Statement. Yang sangat mirip (sesuai ingatan saya) dengan kinerja EMIA (secara keseluruhan dan spesifik), dan bahkan dijual dengan harga yang sama (2.500). Sayangnya, saya tidak bisa membuat perbandingan langsung antara keduanya. Dengan yakin saya bisa mengatakan bahwa audiophile tidak bisa salah dengan salah satu dari kedua model ini, karena keduanya adalah pemain yang hebat. Sebenarnya, seperti yang saya nyatakan sebelumnya dalam tinjauan Coincident, kemungkinan (jika tidak mungkin) banyak pendengar bahkan mungkin memilih salah satu (atau keduanya) dari dua langkah sekarang ke Bent, karena popularitas kekuatan relatif mereka yang lebih besar. . Namun, menurut pengalaman kami, keduanya tidak sesuai dengan Bent Silver dengan kekuatan uniknya, itulah sebabnya saya tetap menyimpannya di sistem saya sebagai referensi pribadi saya (ultimate). Sistem audio dinyatakan tetap sama selama setiap percobaan. Kabel yang digunakan dari EMIA adalah versi 3 dari kabel Reference (juga digunakan dari tonearm), sedangkan Bent memiliki kabel 9 (terhubung secara internal) sendiri ke tahap Jadika JP-80 phono. EMIA memiliki keuntungan sedikit lebih banyak daripada Bent, jadi saya menggunakan pot volume di panggung, cukup satu klik, untuk menyamakannya. Bukti lain - rekan kedua saya dan saya menemukan bahwa lebih mudah mendengar (sebagian besar) perbedaan sonik antara Bent dan EMIA setelah kabel tonton Graham diganti dengan kabel Referensi. Sebelum beralih, kekuatan Bents tidak proporsional dikompromikan oleh kekurangan kabel Graham, oleh karena itu saya memiliki waktu yang sangat sulit untuk membandingkannya pada awalnya. Ini juga merupakan bukti tambahan untuk teori audio yang sudah lama ada (dan banyak lainnya) - Bahkan ada satu link lemah yang cukup untuk menutupi perbedaan sonik yang jika tidak lebih mudah diamati antara dua komponen (dan bahkan perangkat lunak). Rekan pertamaku hanya membandingkan Bent dan EMIA saat menggunakan kabel Graham, yang menjadi alasan utama mengapa aku memberikan pendapatnya bobot kurang dari biasanya. EMIA adalah yang terbaik dengan kabel toningham Graham. Yang memungkinkan semua kekuatan untuk didengar, sambil meminimalkan kelemahan relatifnya. Ini adalah kombinasi mendebarkan dengan materi musik yang tepat direkam dengan baik, berskala besar, dinamis dan dengan bass yang kuat. Namun, penting juga untuk dicatat bahwa kebajikan sonik terbesar EMIA, reproduksi bassnya, pada gilirannya, secara tidak proporsional dikompromikan oleh Kabel Referensi. Dengan demikian, tidak ada kabel yang mengungkapkan keseluruhan kebenaran audio. Hal ini semakin membuktikan teori link yang lemah, sekaligus juga menunjukkan pentingnya kabel sinyal dalam situasi tertentu. Catatan Evaluasi yang Paling Penting: Musik Xmas Abad PertengahanNonesuch, Pines of RomeMaazelMobile Fidelity, The PlanetsPrevinEMI Intact Audio (Dave Slagle) PERNYATAAN COINCIDENT MC TRANSFORMER Pernyataan Coincident adalah salah satu langkah terbaik MC yang pernah saya dengar. Dari jenis apapun atau dengan harga berapa pun. Namun, Coincident dan Referensi Kelas A lainnya, Bent Audio Silver. Keduanya memiliki keunggulan sonik yang menguntungkan mereka. Berikut adalah rincian semua perbandingan langsung antara keduanya (termasuk yang terbaru di tahun 2012): Coincident sedikit lebih unggul dalam rekreasi tubuh, bass dalam dan ukuran gambar. Ini paling mudah didengar di kisaran selobaritone dan lebih rendah. Sementara itu, Bent Silver memiliki kelebihan tersendiri dalam kedekatan, kelezatan, transparansi, kemurnian, kecepatan, kejelasan dan fokus. Namun, perbaikan Bents tidak begitu mudah terlihat karena perbaikan Coincidents. Intinya: Saya masih lebih suka Bent Silver di sistem saya sendiri saat ini, karena perbaikannya lebih baik sesuai dengan kekuatan tahap phono (Jadis JP-80) saya dan preferensi musik saya. Namun, saya masih menduga bahwa banyak pendengar mungkin lebih memilih Coincident over the Bent, terutama karena kekuatannya agak mudah didengar, dan tidak boleh dilupakan bahwa Bent (jika memang bisa ditemukan di tempat pertama) sangat Sulit dioptimalkan, dan bisa bersandar pada banyak sistem, terlepas dari pemuatannya. Coincident bahkan dapat diperbaiki dengan menyolder nilai resistor lain di dalam unit, yang kemudian mengurangi beberapa keuntungan sonik sedikit dari Bent Silver. Ada beberapa kemungkinan dan tujuan yang mungkin penting bagi beberapa pembaca. Pertama-tama, Coincident memiliki keuntungan sekitar 2 db lebih banyak daripada Bent (jika semuanya sama). Ini tak terduga, karena keduanya ditentukan tepat pada 26dB. Saat ditanya, Israel Blume. Coincident, berdiri di samping spesifikasi ini, jadi baik Bent benar-benar hanya memiliki gain 24db (pada tingkat tertinggi), atau Blume salah dan Coincident sebenarnya memiliki 28db gain, yang sama dengan trafo ketiga yang pernah saya dengar. , Teknologi Ekspresif (ET) SU-1. Lalu ada isu pemuatan kritis. Bent memiliki tulisan eksterior, yang dapat dengan mudah dan nyaman dimuat dengan resistor untuk mencapai nilai apapun. Coincident memiliki switch pada panel belakang, dengan 4 posisi, sedangkan ET tidak memiliki ketentuan pengguna untuk pemuatan (kurang dari DIY, setelah membuka sasis). Coincident juga bisa di load gaya DIY, tapi itu juga melibatkan solder. Bent, meski mudah loading, masih sulit dioptimalkan dengan banyak peluru dan sistem, dan ini adalah kelemahan terbesarnya. Sedangkan untuk penampilan, Coincident memiliki bentuk dan tampilan yang sama seperti Line Stage dari perusahaan yang sama. Its juga cukup besar untuk sebuah transformator, dengan berat sekitar 25 lbs. Dan memiliki perisai yang sangat baik. Seperti yang disarankan, saya bangkrut-dalam transformer Coincident dengan 300 jam sinyal CD (level-level). Akhirnya, sementara kami bisa mencoba sejumlah besar kabel, saya dapat menyatakan bahwa Pernyataan itu benar-benar terbaik dengan kabel Coincidents's Extreme Interconnect yang menuju tahap fono (Jadis). Jadi, di mana kita sekarang berdiri di Kelas A Step-Up Universe. Saya tahu tiga transformer MC yang hebat: Coincident, Bent Silver dan ET. Dua yang terakhir sekarang sudah lama dihentikan. Dan sangat sulit untuk menemukan yang digunakan. Bent, jika pernah ditemukan bekas, bisa jadi tawaran nyata. Bagaimana jika Anda sudah memiliki Bent saya tidak percaya nilainya pergi ke Coincident kecuali jika Anda hanya harus mendapatkan keuntungan ekstra, atau Anda mengalami masalah dengan leanness, meskipun mencoba beban yang berbeda. Guncangan sebenarnya di sini adalah dengan ET, yang biasanya menghasilkan banyak uang jika ditemukan digunakan. Artinya sesuatu di kisaran 4.0005.000. Sebaliknya, Coincident Statement yang baru dijual seharga 2.500. Singkatnya, saya tidak melihat alasan untuk pernah mencari ET bekas lagi, apalagi membayar uang yang serius untuk itu. Coincident telah terasa (meski secara halus) kinerja lebih baik, lebih fleksibel dan harganya hampir setengah dari harga (dan bahkan terlihat lebih elegan). Bertepatan juga membangun sebuah transformer perak prototip, tapi secara sonik lebih rendah dari versi tembaga (menurut Coincident ownerdesigner Israel Blume). Dari perspektif sejarah. Melihat ke belakang selama 25 tahun terakhir. Yang saat ET (saat itu revolusioner) tiba di tempat kejadian, sekarang saya percaya bahwa kita berada di dekat akhir garis perkembangan transformator MC. ET adalah lompatan yang benar-benar besar, Bent Silver merupakan penyempurnaan bagus atas ET (meski hanya dengan sistem yang benar), sedangkan Coincident adalah perbaikan halus lainnya atas ET, meskipun dengan fleksibilitas sistem yang lebih besar. Trennya sekarang sudah jelas. Jika, dan kapan, ada perbaikan lebih lanjut, saya berharap semuanya menjadi sama halusnya. Jika tidak demikian, akan ada kemajuan yang lebih serius selama dua dekade terakhir ini. Kenyataan bahwa tiga transformator teratas ini sangat mirip kinerjanya, hanya bisa berarti bahwa semuanya mendekati kesempurnaan, yang didefinisikan oleh saya bukan dalam arti harfiah kata (berbahaya dan terlalu sering digunakan), namun seperti yang dimungkinkan dengan arus teknologi. Secara praktis, ini berarti Anda dapat membeli salah satu dari mereka dengan percaya diri, dan tidak perlu khawatir akan keusangan. Namun, kabar baiknya adalah bahwa Coincident Statement tersedia sekarang. Akhirnya, bagaimana dengan harga jual Coincidents dan nilai untuk uang Coincident agak mahal, meski harganya jauh lebih murah maka sebagian dari kompetisi saat ini (terutama model dari Jepang dan Eropa). Sebenarnya, penting untuk diingat bahwa ET (sekarang legendaris) awalnya dijual seharga 2.500 (20 tahun yang lalu). Dan akhirnya dijual seharga 3.500 (10 tahun yang lalu). Dengan demikian, dengan perbandingan atau ukuran apa pun, Coincident Statement, di 2.500. Pada tahun 2012, hanya bisa digambarkan sebagai nilai uang yang luar biasa. Bertepatan juga memiliki tahap phono yang meliputi dua buah transformator internal MC. Jadi, apa ceritanya disana saya minta kepada Israel Blume untuk mengomentari hal ini. Inilah yang dia kirimi saya (huruf tebal saya): Pernyataan MC dapat disambungkan dengan 20 db atau gain 26dB. Model Anda adalah 26 db, bukan 28 atau gambar lainnya. Langkah integral dalam Pernyataan Phono identik dengan Pernyataan Langkah-langkah terpisah dalam segala hal, kecuali kenyataan bahwa kabel tersebut disambungkan 20 db dan tidak dapat diubah. Harga Pernyataan MC Step-Up (Direct Sale Only) - 2.499 US Berkebun menginformasikan kepada saya bahwa transformer mereka memiliki mark-up paling rendah dari komponen yang pernah mereka jual, itulah mengapa dijual langsung saja. Sebenarnya, dengan markup industri standar, transformer Coincident akan dijual seharga sekitar 5.000. Bagaimana semua ini mempengaruhi pilihan panggung phono. Pembaca yang cermat mungkin memperhatikan bahwa perbedaan antara kedua SUT ini sangat mirip dengan perbedaan yang telah saya jelaskan sebelumnya antara Tahap Coincident Phono dan Jadis JP-80 (sangat dimodifikasi dan saat menggunakan Bent Silver). Ini berarti setidaknya beberapa perbedaan tersebut berasal dari SUT dan bukan tahap MM masing-masing. Kesimpulannya kemudian tak terhindarkan dua tahap MM bahkan lebih mirip dari yang saya pikirkan dan gambarkan dulu, meski masih belum sama. Singkatnya, jika Anda menggunakan Coincident MC SUT dengan Jadis JP-80 yang (sangat dimodifikasi) (melewati tahap MC inferiornya sendiri), keseluruhan kinerjanya sangat mirip dengan Coincident Statement Phono Stage. Perbedaan antara dua tahap MM, sementara masih ada, relatif kecil pada sebagian besar (meskipun tidak semua) kejadian. Dengan demikian, ini menempatkan Jadis dalam posisi yang sangat unik, dan mengajukan pertanyaan Apakah Jadis layak dibeli terlebih dahulu Pertimbangkan perspektif ini. Jadis, jika dibeli digunakan. Dan jika diperbaiki dengan menggunakan modifikasi paling ekonomis (yang masih belum sesuai dengan model referensi saya), akan menghabiskan biaya lebih dari 10.000. Sebuah SUT top-notch masih diperlukan, jadi kita harus menambahkan 3.000 lagi atau lebih (bila juga termasuk kabelnya). Sekarang sampai 13.000 dan, paling banter, ini tetap hanya kompetitif (dan tidak superior) dengan Coincident Statement, yang harganya 6.000. Dan baru. Selanjutnya, sementara Coincident akan terdengar lebih baik lagi dengan pencocokannya (5.500) line stage, itu tidak memerlukannya, sementara Jadis memang membutuhkannya. Sehingga total biaya menjadi sekitar 19.000 (jika juga termasuk sepasang kabel lainnya). Jadi, perspektif dan nasehat saya tentang tahapan pho phortia Kelas A kini telah berubah. Pada saat ini (0412), saya tidak melihat alasan untuk pernah membeli Jadis JP-80 (MC). Satu-satunya kemungkinan pengecualian adalah jika Anda sudah memiliki SUT Bent Silver, atau tahu, pasti. Anda bisa mendapatkannya dan juga siap untuk melakukan semua modifikasi JP-80 saya. Bahkan jika Anda sudah memiliki JP-80 (MC), saya akan menjualnya kecuali Anda memiliki akses ke Bent Silver dan juga siap untuk menyalin semua modifikasi saya. Jika ini semua selesai, Anda akan memiliki tahap phono superior, namun akan membayar biaya yang sangat besar untuk keunggulan ringan itu. Jika tidak, keuntungan sonik apapun dari Coincident Phono Stage, jika mereka memang ada di tempat pertama, akan menjadi hal yang paling kecil, dan kemudian hanya setelah masih mengalami masalah dan biaya yang besar. Lebih buruk lagi, tidak boleh dilupakan bahwa bahkan saat itu masih akan ada keuntungan sonik yang lebih nyata. Intinya - Investasi di Jadis, baru atau bekas. Hanya tidak beralasan di bawah hampir semua keadaan praktis. Akhirnya: Bagaimana dengan saya, saya sudah memiliki Bent Silver dan saya telah melakukan semua modifikasi yang diketahui di JP-80, yang membuat saya menjadi pengecualian yang langka. Saya jelas lebih memilih hasil akhir, jadi saya harus menjaga apa yang saya miliki. Mungkin aku beruntung, atau mungkin aku ulet, tapi aku punya apa yang kuinginkan sekarang. Yang saya jelaskan secara rinci di Bagian Dua dari edisi 2011 fono essayreview. Update Penting dari bulan November 2012. Saya pernah memiliki Coincident MC Transformer di dalam dan di luar sistem saya selama lebih dari dua tahun sekarang, namun sampai saat ini saya hanya mengikuti audisi versi standar 26 dB (Im tidak menghitung versi yang digunakan dalam Coincidents Phono Stage). Sekarang saya akhirnya mendengar versi 20 dB (dengan Jadis JP-80). Ini adalah transformator yang sama persis, kecuali beberapa perubahan kabel internal sederhana. Perubahan ini bisa dilakukan oleh Coincident pada saat pembelian, atau nanti oleh siapa saja yang berguna dengan solder (sekitar 30 menit kerja), dan bisa dibalik jika diinginkan. Jadi, bagaimana cara mereka membandingkan satu sama lain (Sistem referensi sama persis, termasuk kabelnya.) Jawaban mudah: 20 dB lebih unggul, dengan cara yang sama dengan versi 25 mV dari kartrid MC akan lebih baik daripada .50mV versi cartridge yang sama (meski tidak sampai tingkat yang sama). 20 itu sedikit lebih cepat dan lebih jernih dan tepat (ringan di kakinya), dan tanpa kerusakan yang bisa saya deteksi. 26 yang terdengar seperti kartrid dengan VTF sedikit terlalu tinggi. Dua versi ini jelas jauh lebih mirip daripada yang berbeda, namun perbedaan kecil yang ada ada baiknya bagi 20. Jadi, apa yang saya sarankan kepada mereka yang tertarik untuk membeli komponen ini Siapapun yang memiliki keuntungan yang layak dalam tahap phono mereka, ditambah tahap garis di Sistemnya, harus mendapatkan 20. Jika Anda tidak yakin, saya masih akan mendapatkan 20 jika Anda (atau teman) kompeten dengan solder, karena bisa dengan mudah dikonversi kembali menjadi 26 jika perlu. Jika sistem Anda memerlukan setiap dB keuntungan yang bisa didapatnya, daripada Anda tidak punya pilihan selain mendapatkan 26. Harganya sama untuk keduanya, jadi bukan faktornya. Akhirnya, bagaimana dengan seseorang yang telah memiliki (26) kebetulan dalam sistem mereka Jika Anda memiliki lebih banyak keuntungan daripada yang Anda butuhkan, maka saya akan mengubahnya menjadi (20), ASAP, dengan satu atau lain cara. Bagian Kedua - Membandingkan 20 dB Bertepatan dengan SUT Bent Silver Seperti yang telah saya lakukan sebelumnya (setelah mendapatkan kesan umum Pernyataan dengan berbagai jenis musik), saya sering bolak-balik beberapa kali dengan program tertentu (dan sangat familiar). bahan. Saya dengan teliti menghindari membaca penilaian saya sebelumnya, karena kekhawatiran saya tentang bias potensial (dan pemikiran malas). Anehnya, saya harus menahan Bent pada pengaturan 26 dB saat ini agar sesuai dengan level volume (atau gain) yang sama dari Coincident pada setting 20 dB-nya. Saya tidak dapat menjelaskan alasan perbedaan jelas ini dalam keuntungan tertentu, yang telah saya catat sebelumnya (meskipun bisa dikaitkan dengan kartrid phono yang digunakan). Akhirnya, saya menggunakan kabel interkoneksi Coincident (top of the line) terbaru dari transformator ke tahap fono (Jadis), yang disarankan (dan diberikan) kepada saya oleh pabrikan. Hasilnya setelah semua ini. Akhirnya aku menyadari bahwa tidak banyak yang berubah. Saya berasumsi karena perbedaan antara dua setting Coincident (26 dan 20), meski mencolok, tidak begitu signifikan dalam gambaran besar. Singkatnya, saya masih lebih memilih Bent Silver, dalam sistem saya sendiri. Untuk alasan yang sama yang telah saya berikan sebelumnya (lihat File Langkah Tambahan MC untuk rinciannya). Dan, seperti sebelumnya, masih ada plus kecil dan minus untuk keduanya. Menggunakan My HierarchyLevels of Audible Improvements. Saya sebelumnya menggambarkan Bent SilverCoincident sebagai perbedaan Level 3, sementara saya merasa bahwa perbedaan 2026 lebih dekat ke Level 2. Selanjutnya, penting untuk diingat bahwa Tingkat yang berbeda ini tidak mutlak atau tepat. Ada nuansa pada setiap Level (2.1, 2.2, 3.1, 3.2 dll). Pada kenyataannya, mungkin diperlukan beberapa perubahan Level 2 yang setara dengan satu perubahan Level 3. Jadi, pada akhirnya, semuanya tetap sama, kecuali apa yang telah saya jelaskan dan sarankan di bagian pertama pembaruan ini (di atas). The Bottom Line - The 20 Coincident adalah peningkatan yang nyata dari 26, dan harus digunakan jika praktis, namun tetap tidak menutup (bahkan lebih) perbedaan kinerja yang nyata antara itu dan Bent Silver, setidaknya di sistem saya. Meskipun ada kemungkinan bahwa Coincident mungkin akan semakin meningkat dengan perubahan impedansi resistor internal (yang berarti saya mungkin masih belum pernah mendengarnya dengan sangat baik), saya tidak ingin melakukan usaha itu saat ini. Akhirnya, untuk mengulangi, sekali lagi, The Big Picture ketika sampai pada transformer MC terbaik yang pernah saya alami: Hanya ada tiga transformer step-up besar yang saya tahu, dengan pasti. Ada Bent Perak dan Teknologi Ekspres ultra-langka SU-1 (keduanya tidak digunakan lagi), dan Pernyataan Coincident yang masih tersedia. Ekspresif adalah cara yang terlalu mahal saat dibeli digunakan dan tidak memiliki saklar impedansi, meskipun memiliki keuntungan yang cukup besar (28 db). Bent memiliki potensi tertinggi dalam pengalaman saya, dan ini juga memiliki switching impedansi termudah dan terbaik, namun memiliki keuntungan paling tidak dan tidak memiliki kemampuan untuk menambahkan tubuh ke kartrid (atau sistem) yang ramping (atau sistem, yang telah mendiskualifikasinya Dalam lebih dari sekali contoh yang saya ketahui secara pribadi), jadi ada risiko ketidakcocokan yang nyata. Coincident juga memiliki banyak keuntungan, pengaturan impedansi yang layak (meski tepat memerlukan penyolderan internal) dan kompatibel dengan setiap kartrid phono (atau sistem) yang dapat saya bayangkan. Hebat-Tak satu pun cacat serius yang pernah kudengar. BENT AUDIO TX-103 SILVER TRANSFORMER Bent Silver masih merupakan perpindahan koil bergerak terbaik yang pernah saya dengar. Rekan saya setuju dengan pendapat ini Satu peringatan utama kami adalah harus dimuat dengan benar (lihat detailnya di file khusus. Link di bawah ini). Kinerja Bent Silvers yang luar biasa mengilhami saya untuk menulis sebuah perspektif dan sejarah yang mendalam tentang Langkah-up, yang walaupun penting penting dalam sistem phono, mungkin merupakan kategori komponen yang paling diabaikan dan terbengkalai dalam penelitian dan pengembangan. Apatis audio ini adalah alasan utama pilihan model yang menyedihkan yang tersedia untuk audiophiles serius. Bent Audio Silver MC Transformer File Dedicated TEKNOLOGI EXPRESSIVE TRANSFORMATOR SU-1 Ekspresif adalah satu-satunya peningkatan Kelas A yang pernah kami alami. No other step-up that I am aware of, except the Bent Audio Silver above (along with the Bent Copper and ZYX below), even comes close to it. It is virtually flawless in sound quality. This company is now out of the audio business . another audio tragedy. This transformer performs at its best with low impedance moving coils. It doesnt work well with all cables, because of the potential groundhum problems. The input impedance of the preamplifier should be 47K. The ET will improve the performance of all preamplifiers, with the single exception of the Audion Quattro . and maybe some custom models that have recently become available. It was very expensive at 3,500 U. S. . Very difficult to find used. This may be that extremely rare final purchase. (I would avoid using their own phono cables. While they are very good and well made, there are others that are even better.) FURTHER - Expressive Technology also had an all-out preamplifier, with a phono stage. They worked on it for 7 years. It cost 15,000 . and only a few were made. This is the preamplifier that Myles Astor . of the (now former) print magazine Ultimate Audio . actually refused to listen to with his own analog front end. See Reviewing the Reviewers . I dont know anyone who has actually heard it. ZYX MC CPP-1 PRE-PREAMP This is, most likely, the finest head-amp Ive ever heard. I state this because it is competitive with the finest transformers Ive had, while all the many other (external) head-amps Ive heard are simply not in that league. Disclosure - The ZYX head-amp is a solid-state device It is highly unusual for a successful cartridge manufacturer to also design and build an audio component that is so different in fundamental nature (non-mechanical in this instance), with such excellent performance. The relevant details. The ZYX Compared to the Bent Silver The ZYX basically equals the Bent Silver TX-103 transformer in immediacy, neutrality, frequency extension and the size of the soundstage. The ZYX has excellent channel separation, and the macro dynamics are absolutely breathtaking. In direct comparison, the Bent Silver is superior in two areas its ultra-low sound-floor and its freedom from electronic haze. These areas are considered subtle by many audiophiles, though not me, and can be especially noticeable on certain acoustical music. Please dont misunderstand me, the ZYXs background noise (hiss) is very soft, basically non-existant, and lower than any head-amp Ive ever heard. It just loses a bit of individuality, harmonic completion, sense of space and micro dynamic tension compared to the Bent Silver. Its not alone, so does every other step-up Ive ever heard. For the sake of perspective the ZYXs weaknesses, only compared to the Bent Silver, are still actual strengths compared to almost every other step-up Ive heard. Thats how good it is. In fact, there were many times I was not even able to distinguish between the two of them, because their basic sonic character is so similar . ( I wrote previously that I believed that even a perfect step-up wouldnt be that much better than the Bent Silver. This is because I felt that the Bent Silver is already pretty close to perfect itself. The closer components come to practical perfection, the more similar they must sound, no matter how differently they are designed and built. This is because they will have fewer imperfections to distinguish themselves from each other. All happy families resemble one another, but each unhappy family is unhappy in its own way.-Leo Tolstoy, Anna Karenina) The ZYX also has some practical advantages. Other Factors and Compatability While both the ZYX and the Bent Silver are rated at 26dB of gain, the Bent Silver loses some of its gain as soon as it is loaded-down, which is a requirement. The ZYX is already loaded-down as is, so it has more real gain in practice. For many systems, this may prove irrelevant, but in my own system, it is the difference between some records coming alive, or not. There is another advantage to the ZYX it is virtually cable proof, since it is an active device. While signal cables, both to and from the ZYX, are still obviously important, theres never going to be a true mismatch. Sadly, this is still possible with the Bent Silver, because it is passive by nature. Ive already directly experienced this potential problem. This reality can be critical for cable freaks andor experimenters. In short, the ZYXs high level of performance can be experienced in every system, while the Bent Silver, though it has even greater potential . will only reach that potential with time, effort, patience and maybe some further expense. Some Practical Information The ZYXs power supply consists of high-quality ( 9 NiCd ) batteries, which are re-charged in a few hours (overnight is easiest). It broke-in very quickly, only after around 10 hours or so of play. It doesnt sound good for the first few minutes of each session (its veiled, dry and ill-defined), but it warms up fast, and after 20 minutes (1 LP side), its already at its best. It can also be played while the batteries are being re-charged, but Im not sure about the sonic compromises, if any, while doing so. Despite the ZYXs relatively small size, and its lack of a large power supply reserve, I can assure you that its large dynamic swings, plus its middeep bass weight and impact, are as good as Ive ever heard. These qualities, plus its outstanding neutrality, immediacy and spooky silence, are what most impressed me about this unit. All of this was unexpected. The standard model of the ZYX pre-preamp has 20db of gain, with a slightly simpler circuit. Its very possible, if not probable, that it will sound even purer. Conclusion and Advice This is the step-up to get if you want superb sonics, complete background silence, with no fussing around and total cable compatibility. If theres a better head-amp around, I havent heard it, or even of it, yet. Its selling price is 1,650 . direct on Audigon . which is 375 more than the Bent Silver. This may be an issue for some. However, for those audiophiles who dont like any MC transformer, for whatever reason(s), the ZYX is a no-brainer choice, if its affordable. The Bent Silver still has greater potential, which is why it is in Class A . but I cant absolutely promise you that this potential will be realized in every system. For the most serious phono fanatics, meaning those audiophiles who are prepared to make every effort to optimize it, the Bent Silver continues to be my highest Reference and, it shoudnt be forgotten, it can never break down. Just dont forget the caveats Ive posted. It must be emphasized that I have not yet heard the Bent Silver or the ZYX CPP-1 at its best: The Bent Silver can still be loaded-down some more, and the ZYXs 20dB gain model has still to be properly auditioned. Both require either a more sensitive system, andor a cartridge with higher output. This will all happen in the next few months. The first ZYX UNIverse I will audition has a .48mV output (while the Airy 3 Im now using is .24mV ). Im also receiving more sensitive amplifiers and speakers from Coincident Speaker Technology . The more I think about this, 2006 is shaping up to be a truly major year for audio developments and its evolution. AUDIO RESEARCH MCP-33 The ARC was a pre-preamplifier that used 6DJ8 tubes as amplifying devices. It is one of the two best of its type ever made and is very well built. It is an excellent performer, but far behind the Expressive above, since it just makes this class. It can be improved with modifications. The biggest problems with the MCP-33 is that the high quality, low-noise tubes (6DJ8s) it uses are not only difficult to find, but they also turn noisy quite quickly. More Recent Information (305)- I received a letter from a reader who feels he may have solved the inherent problem of this component tube microphonics . Here it is, with slight editing After experimenting with various types of tube dampers and cones, I found that the spring suspensions made by Loyalty Sound of Alberta, Canada . could be the most effective cure for the noise problem associated with the MCP33. After supporting the MCP33 on a set of the Loyalty spring suspension, I found that there was no need to put tube dampers onto the 6DJ8 tubes. These spring suspensions could also be used to good effect for supporting CD players. I have heard significant improvements in sound stage and even tonal balance after a friend of mine put a set of these suspensions to support his Marantz CD7 . which build quality is already rather exemplary. It should be noted that however the spring suspensions must be carefully placed so that all three individual suspension is subject to a similar loading (which could be verified using a spirit level). Loyalty Sound offers different spring ratings (140 lb, 70 lb and 40 lb) for the suspensions. The suspensions I used for the MCP33 are of 40 lb rating. The spring suspensions, just slightly cheaper than the Goldmund cones . are quite expensive however. Personal Notes - This letter almost seemed like an advertisement for Loyalty Sound, but this reader is most likely unaffiliated with them, and he could be right, so Im requesting feedback about these springs from any reader who has first hand experience with them. Also, despite this readers judgement, I still feel that Herbies Tube Dampers are a requirement for the 6DJ8s used in this unit. The Classe was the finest solid-state head amplifier ever made (until the ZYX CPP-1 above). It was beautifully built, it weighed 35 lbs. . and it even had a separate, heavy-duty power supply. The majority of phono stages and step-ups of today are literally like toys compared to it. It had some (potential noise) problems with set-up when it came out because of the cables of its day, but that shouldnt be a problem now. The sonics can be described as very clean, detailed and dynamic. It still had some transistor problems (some dryness, darkness and hardness), but they were more subtle than any other solid-state model. TAS . in its review (Issue 34), also mentioned some soundstage anomalies. I didnt find them to be a serious problem. Its a shame that no one today makes a modern, improved equivalent of this component. This model will be hard to find, but its well worth the search. It was designed by the original (and now former) owner of Classe Audio, Dave Reich . who wasis both talented and passionate about audio. BENT AUDIO (STEVENS BILLINGTON) TX-103 COPPER TRANSFORMER I first heard this transformer in my friends system, where we compared it to the EAR MC-3 and the MC stage of his Audion Quattro . We both preferred it to the EAR, but we also felt the Quattro was still slightly better, overall. The TX-103 did have an advantage in the high frequencies when the music was loud and complex. It retained its integrity, while both the Quattro and EAR had problems. Ive now lived with the TX-103 in my own system for more than six months. When first compared to the EAR, it was slighty, though still noticeably, superior in transparency, immediacy, preserving inner details, definition and it had a lower sound-floor. They were basically equal in neutrality and in the frequency extremes. Since then, I have broken in the TX-103 using the helpful instructions from Thorsten Loesch . The improvement was quite noticeable, which means this transformer is now competitive with the Audion Quattro and the (Class A) Expressive Technology . (One of my associates will try to arrange a shoot-out with the Expressive and both the silver and copper TX-103.) The TX-103 has one important practical advantage that converts into a sonic plus its output consists of a short (7) wire with a RCA male termination, which allows a direct connection into the phono stage without the need of an extra cable. My TX-103 is a DIY copper version, but recently this company came out with finished models. According to their website, the copper version is 745 and the silver is 1,075 . I expect to audition a finished model, including the silver version, in the next month or so. See Bent Audio . the North America distributor, in the Links File for more information concerning this component. Break-In Instructions from Thorsten Loesch This worked very well for me, so I recommend it highly. This is what Loesch wrote, with a little editing: (The TX-103). will require a substantial period of forced burn in to give its best, simply because the magnetic core is huge and will not see much magnetisation with normal MC signals. Please consider connecting a CD-Player to the secondary (Output) of the TX-103 and then terminate the input with a low resistance resistor (quality uncritical), Id say 27 Ohm when connected for 14db gain, 6.8 Ohm when connected for 20db gain and 2.2 Ohm when connected for 26db gain. Leave with a highly dynamic, wide bandwidth signal CD to play for a week or two. I would use music, but Id expect pink noise to work well too. Personal Note - While on a weeks trip, I connected the signal (a tuner on a 24 hour grunge station) to the primary (Input) instead, and had great results. The rest of the circuit followed Loeschs instructions. MITCHELL COTTERVERION TRANSFORMERS These models were the finest moving-coil transformers ever made at one time, and the best I heard, overall, before the Expressive Technology came into existence. They had excellent sound natural, detailed and dynamic, though with both of the frequency extremes rolled off a little. It came stock with its own ( 4 ) output cables already attached, which was a strong advantage, but now it is a decided disadvantage. The cables excessive length and (now) mediocre quality both compromise the Cotters inherent performance. A competent technician must be found to remove and replace them with good quality RCA females, which would then allow the use of any superior phono cable. There are different models of this transformer that have different input impedances. The model with the lowest input impedance ( 2L ) is usually the most desirable version with current cartridges. The Verion was the exact same transformer as the Cotter, before the name changed due to legal reasons. However, unlike the Cotter, no version of the Verion was ever offered with the lowest ( L ) input impedance, as far as I know. FURTHER: The original Bryston transformer (black) was the exact same model as the Cotter, with just a different name and color. It was even built by Cotter. However, the current Bryston transformer, with the model name TF-1 . is a different design. Chris Russell . the CEO of Bryston, claims this model has a wider bandwidth and 40 of the measured distortion of the CotterVerion unit. I am sad to admit that I havent heard this unit, despite the fact that it is made in Canada. The RWR is a MC transformer that is very similar in sound quality, size and shape to the Cotter. The Cotter is only very slightly better. This model also has the important advantage of user switchable input impedances, which the Cotter lacks. This could be an important feature for those audiophiles who change their cartridges on a regular basis. It is very rare and was built in Canada. This is another transformer that is very similar in quality to the RWR above. Its also very rare and difficult to find. Further - A reader has informed me that he compared this model to a Verion (Cotter). He felt that the Verion sounded thin and harsh by comparison. He also commented that the Audio Interface lost nothing at the frequency extremes and had plenty of body. In another comparison, this same reader felt that a different version of the Verion was much better (a dramatic improvement), but it was still not the equal of the Audio Interface. Even if both of the Verions had an impedance mismatch, the fact that the Audio Interface was equal or better to them is a very strong endorsement for this model. KLYNE SK-2 PRE-PREAMP The Klyne is a very good and versatile pre-preamp, and its solid-state It is neutral and it retains the frequency extremes. This was the finest transistor head-amp before the Classe NIL came out, and it is very possible that it is still more neutral than the NIL. It also has switches for both input impedance and a variable capacitor filter to tame cartridges with high-frequency peaks, which were common 20 years ago. As for its performance, its somewhat dry and a touch noisy in comparison to the others. Their earlier model, the SK-1 was too noisy for very low-output pickups (below .4mV). This exact same headamp is also incorporated inside some of the Klyne preamplifiers. EAR MC-3 TRANSFORMER Ive lived with this transformer and I am impressed with it. I used it with a Shelter 901 within a system in which the entire front-end was new to me. Meanwhile, one of my associates also has some experience with it. The MC-3 has 3 inputs, each with different gain and input impedance, and one output. The sound varies with each choice of input. I had no problem with hum andor noise with it at any time. In fact, it is dead quiet, at least in my system. At its best, using the lowest impedance and gain with the Shelter, it is neutral and has excellent midrange naturalness, detail and dynamic force. The bass is also special, especially for a transformer, going deep and with detail and impact. The high frequencies are also good, being smooth and clean, but there is a sense of a rounding of the tiny details which individualize music. This may be caused by either a roll-off or a subtraction of low-level harmonics (and other musical information) or both. One other problem is that this model doesnt have the dynamic jump or shock of the Expressive Technology transformer, though it is competitive in this area with other step-ups. The Expressive should be better, costing more than 3 times the EARs price. The timing or phase of the EAR is good, but it is not quite as precise as the Expressive, so the music isnt quite as intelligible, and the soundstage isnt quite as large or as focused. This is the best value, in every way, for a step-up being made today that I know of. It may even be preferable to the other Class C models. Further - I have since heard this transformer on an associates system and I have also logged more hours on my system. I now feel that I can faithfully describe its performance. It is very neutral, and the frequency extremes are excellent, both are extended, especially in the bass. The dynamic qualities are also excellent. There are problems though. There is a noticeable drying of the sound meaning a reduction of low-level detail. You hear less definition, natural texture, air and harmonics developing and decaying. There is also a slight reduction of image size and focus musicians are a little diffuse sounding. It is still the finest MC transformer Ive heard for the money, but it wont join the Class B models as I had originally hoped. ( 603 ) CONRAD JOHNSON PRE-PREAMPLIFIERS (HV-1HV-1AHV-2PREMIER 6) I sold this line in the earlymiddle 1980s, and even owned one of these models personally for a time. They were all excellent, with full bodied sound that this company is famous for, and also less residual hiss than most typical tube headamps. The later models were a little more transparent, faster and cleaner than the original HV-1. Unfortunately, none of them were quite as immediate, clean, neutral or dynamic as either the ARC MCP-33 in Class B or the Counterpoint SA-2 below. They all used tiny 6CW4 Nuvistors instead of traditional 8-pin tubes, and I remember the circuit boards being suspended by rubber bands for improved isolation. I dont know whether or not these Nuvistors can still be replaced today. Win Research - This transformer may qualify for Class B or even Class A ranking. Stay tuned and hope for the best, because it is far less expensive than the Expressive. Counterpoint SA-2- This was a serious tube head amplifier. At its best, it was one of the two finest ever made, along with the ARC MCP-33 above. Unfortunately, it had problems with reliability, hum and excessive tube noise. The (6DJ8) amplifying tubes had a tendency to become noisy in a very short period of time. I had experience with two of the early models, and I was never able to keep them working, at an optimum level, for more than a week or so at a time. The later models were supposed to be improved, especially in the area of reliability, but I am not able to verify this claim at this time. I would avoid this model unless there is an extensive audition or a money-back guarantee. EAR - The early ( 1980s ) EAR transformer was very large and heavy for its time, and it had extraordinary gain and dynamic qualities along with a large sound and deep bass, but it also had problems with noise, hum and even had some frequency irregularities. In the right (though unusual) circumstances, it could be superb, but this is another try it before you buy it component. Koetsu - I was a Koetsu dealer for more than 10 years, and I had extensive experience with virtually all their cartridges and their moving coil transformer. Their transformer was expensive for its day, but then nothing from Koetsu was ever a bargain. It was enthusiastically hyped by the Koetsu distributor before it was released. The performance was mainly typical of the moving coil transformers of its day. It had an excellent midrange, definitely better than average, with good body and excellent retrieval of low-level information. The problem was the frequency extremes, which were noticeably rolled-off, especially in the bass. There was poor mid-bass impact as well. It was a big disappointment for me at the time. In the final analysis, this was a good but overpriced and over-hyped component, that never lived up to its very high expectations. The fact that it is mainly forgotten today is its testament. Quicksilver - This was a small and modestly priced transformer. It was clean, smooth, quiet and detailed. It was especially impressive in the high frequencies, with extraordinary extension for a transformer. Unfortunately, the bass was very noticeably rolled off and it was also dynamically compressed. Further, it was not quite as rich or as full-bodied sounding as the much more expensive Koetsu. It was still a good value, considering everything. Marcof PPA-1- This was a unique battery powered unit that was popular in the early 1980s. It was very inexpensive and had OK sound considering the cost. Its main sonic problems were a relentless background hiss, dynamic compression and a very noticeable dryness. This model is only for beginners or those on a really tight budget. Shelter - I havent heard this SUT model myself, but one of my associates had it in his system for a while. He said it was decent, but not outstanding, even for the money. Bobs Devices CineMag Step-Up Transformer I listened to this model for a few evenings, and having now returned to my current (Class A) reference, I am satisfied that I generally know what its doing, and not doing. Since this SUT costs far less than any of the models I have lived with, and reviewed, over the last 20 years, I was hoping that lightning would strike, but that was sadly not the case. Im sorry to report that its performance doesnt approach any of my top References. The details (as far as I can provide)- It lacks the immediacy, transparency, (inner an outer) detail, purity, speed and low sound-floor of the top reference models. It also has an easily noticeable character, which I would describe as warm, full bodied and forgiving. Some would call it musical for that reason, and I realize that some listeners are specifically looking for this, but it could also be justifiably described as predictable, which is not as flattering (or ever desirable for me). I also realize its unfair to compare the Cinemag, at 395 . with units costing 5 to 10 times more, but I dont have access to similar priced models at this time (in contrast to when I owned an audio store). To be frank, I also dont have the time, or the required interest, to audition anything less than all-out SUTs any more. So, in the end, I dont know how the CineMag compares to its true competitors. I can say that it is not irritating, as were many step-ups Ive heard in the past (mainly transistor head amps). The sound was always pleasant, whatever record I played (like early Magnepans ). Depending on your perspective, this could be either a positive or negative attribute. For me, it is negative, though its possible that, these days, Im in the minority here. I further realize that I may not be hearing the Cinemag at its very best, since it is not easy to optimize the load (which can be done by soldering in resistors), but my cartridge and phono stage were also known in advance by the manufacturer. So what do I advise If the unit, as I described above (and there are other reviews of it on various websites), still interests you, then I would directly contact Bob Sattin (bobsdevices ). Considering that Bob loaned me this unit for 20 months() . and without any complaint I might add, Sattin is obviously a reasonable person to deal with. He also has alternative SUT models from both Altec and Sowter . along with the Zu-Denon 103R . Odds and Ends - I broke in the CineMag for around 300 hours before I played it. It also has a gain switch (with two positions) as well as a ground lift switch. It was dead quiet, and I never had a problem with hum. For instance, in contrast to what I wrote above, it received rave reviews at Stereophile (Art Dudley, Listening 90) . as well as: 10audiobobsdevicesstepup. htm I rarely take this long to get to something, but an avalanche of unexpected components, plus historically poor weather, and component breakdowns, changed my schedule numerous times during this period. ( 1010 ) CAVEAT - Please be advised that the readers letters posted on this site are solely the opinion of that reader and may not necessarily represent or reflect the opinions of Arthur Salvatore or High-End Audio. These letters furthermore, are not to be taken as being endorsed by Arthur Salvatore or High-End Audio. They are posted because they may be edifying, thought provoking or entertaining. BENT SILVER TX-103 TRANSFORMER - I recently received an e-mail from a long-time reader and contributor . Thorsten Loesch . with news of a different version of this superb transformer, plus other components from the same source. Here it is: Just a note or two for you. Music First Audio . a subsidary of Stevens Billington . manufacture a fully featured step-up unit of my design around the TX-103 (silver is available on request), including switch adjustable loading and step-up, as well as a most excellent passive preamplifier based around transformers (again mostly my design - the background sketch on the front page is an early drawing of the circuit for it): While more expensive than Bent Audio product by the simple fact that, unlike Bents direct sales, Music First Audio Products are distributed through normal distribution and dealer channels they do offer a different take. Personal Note - I like options, so this is more good news for audiophiles. Conrad Johnson Premier 6 MC Step-up Heres some useful information from a reader about tube replacements for this reference step-up. . I have been usingloving one for about a year now and thought you should know that the tubes (4 x 6CW4 Nuvistors or 6SD4 ) are very readily available NOS on ebay even today, and they are fairly cheap too, 10-20 a piece. I am using 4 RCAs and the analog sound is really great, much better than any of the solid state stepup units or transformers I have tried ( Naim, PS Audio, Denon etc). Another nice thing about the Premier 6 is the cartridge loading can be set internally with plug in resistors anywhere from 2K ohms to about 10 ohms. And yes, you were correct, the main circuit board floats via rubber bands to eliminate any possibility of tube microphonics messing up the sound. (108) A veteran reader sent me his latest observations. Here it is, with some minor editing and my bold : . Finally, I wanted to let you know of an incredible bargain in the domain of stepups: the K K Audio MC phono Step-up . Ive had it for a couple of months now and have spent quite a bit of time comparing it with the ZYX CPP-1 . which I was using previously. Although the KK costs (far) less than the ZYX ( 290 in kit . 350 assembled ) and based on Lundahl transformers ( kandkaudiophonostage. html ), its actually better, in particular in the areas of clarity, frequency extension and inner detail. The ZYX is really lovely tonally, specially with piano and other single acoustic instruments (violin, cello are very good). The KK seems a little thinner at first, but its just a different timbral quality not harsh, certainly, just a bit lighter. In comparison, the ZYX sounds like it has a hump in the mid-bass which brings a bit of congestion. Indeed, where the KK really shines is as soon as the texture gets denser, because it allows for a clearer view inside the instrumental combinations, with more air between instruments and registers, so that polyphonic lines or even individual notes in harmonies are easier to differentiate. (Comparison made with a ZYX Airy 3 and the new Hagerman Trumpet at either end of the step-up. The load in my KK is 120 Ohms (20 KOhm resistor), and it has 20dB of gain, but it can be ordered in other configurations of load and gain.) The Trumpet is actually quite a hard unit to beat. I have the opportunity recently to test the Artemis Lab PH-1phono preamp . and after many attempts at optimizing it with various loading resistors, I couldnt get rid of some harshness in the treble it did actually sound better with the ZYX CPP-1 than the KK step-up, but I suspect it was because each units faults were somehow compensating each other. The KKTrumpet combination has more transparency, natural tonality and detail and its a lot quieter, too. Still, Im wondering how the Trumpet would fare against the KK phono preamp. (708) Some Cinemag Observations A long-time reader . who is also an audio manufacturer . periodically sends me some of his latest observations and thinking about various subjects. I removed the material that may have conflicts andor sensitivities, but the remainder is still quite interesting and potentially highly valuable, with my bold as usual: I just want to pass on a few observations and suggestions, based on your recent updates. Regarding the CineMag step-ups that are packaged by Bobs Devices . based on the 10 Audio review, Im sure that Bob has made no provision for adjusting the loading resistor. Jerry mentions that while he likes the sound in general, he says its really stunning with the Denon DL-103R . This makes sense, since that cartridge has a 14 Ohm internal impedance and, with the CineMag, is looking for a 47K Ohm phono load. That just happens to be the default resistor which almost every phono circuit uses, so no load adjustment is required. However, the lower the internal impedance of the cartridge, the lower the phono load needs to be. Otherwise, the CineMag sounds too hard and bright. For my MoFi-branded Miyabi . which has a 2 Ohm internal impedance, a 10K load works best. Of course, thats based on the fact that I can remove the 47K resistor from my phono circuit completely and replace it with any other value. Since most 47K resistors are soldered in place, youll have to experiment when using one that parallels the 47K default. Unlike normal cartridge loading, gross steps, such as 5K or 10K between values, are fine enough. As a caveat, I also found that there is a synergistic relationship between the circuit and the CineMag that goes beyond proper loading. You may find that its character will change, with the phono circuit that its feeding. (0210) THE REFERENCE COMPONENTS The Supreme Recordings My Audio Philosophy If you have a question. or want audio advice andor consultation: Important Notice - As of October 1, 2012 . there is a minimum fee of 10 for me to answer a simple enquiry, which means any question that I can answer quickly without research. Anything else will cost more and I will accordingly provide quotes for approval. PayPal is being used for its convenience, universality and security. If interested, click on Ask Arthur . There are two exemptions to the payment fees. 1. Those readers who have provided an important service (usually information that was posted) to this website over the years. 2. Those situations where I feel that I overlooked something important andor was obscure in my post, and thus some necessary clarification is required on my part. That will always be gratis. I dont believe in being unfair or petty, especially to my own readers. Telephone Conversations - If a reader feels it is necessary to actually talk to me directly, this can be arranged if I also feel it is appropriate. There will be a minimum fee of 50 . Ask for the details before paying the fee. Finally, a veteran reader wrote that I should also have a link for (generic) donations to keep the website going . I replied that the Donation button can also be used by appreciative readers for that purpose. Needless to say, any unsolicited donation from a generous reader receives my sincerest thanks and gratitude. To contact me for any other reason: COPYRIGHT 1999-2016 ARTHUR SALVATORESource code available here: 8211 OpenCV Library ( At the time of this article I was using Version 1.1pre1, October, 2008) Once you have instaleld the libraries and downloaded the code open OpenCV-Qt-StereoVision. pro in QT Creator. Update the paths to where your OpenCV library is installed (replace every occurrence of C:SDKOpenCV to the path where you installed OpenCV). It is assumed that you have 2 USB cameras connected to your PC and there are no other cameras connected to computer. If this is not the case then you might want to have a look at StereoCamera::setup() in stereocamera. cpp. It is assumed your cameras can capture 640215480 images. If you don39t have the cameras yet, but would like to test the sofware using the included images sets (see images folder). Open mainwindow. cpp and comment out timer. start(50) while uncommenting one of the 2 lines: stereoVisionTest(quot..imagesset1quot,7,4) run test1 stereoVisionTest(quot..imagesset2quot,9,6) run test2 If you get any compiler errors make sure your Qt and OpenCV libraries are installed correctly. For that matter try to create a new test QT project and make sure it compiles. Before your cameras can see in 3D you need to perform a calibration sequence. 8211 print out the following PDF. ChessBoard 8211 Stereo Calibration. pdf and tape it to a solid piece of wood, plastic or fiber glass (make sure the image is not bent or calibration will not work). 8211 focus your cameras so that the text on the chessboard is readable, make sure you don39t modify the focus of cameras after calibration or during calibration since the focus is an important factor in calibration . 8211 start calibration by clicking on Start Calibration button in software, place the chessboard in front of the cameras so that it is completely visible in both cameras. - software will take samples every 5 seconds. until the specified number of samples has been taken (10 by default). - once calibration is complete click quotSave Calibrationquot to save calibration data to a file (calibration will be reloaded next time you start the program automatically). - if you modify position or focus of cameras you will need to calibrate. - pay attention to 39rectified39 image. if a line intersects an object or a spot on the left image it should intersect same object or spot on the right image. This is an indicator that your calibration is correct. - if you have valid calibration data you should see the normalized depth image in the quotDepthquot window IMPORTANT UPDATE July 3, 2010: Updated code to work with OpenCV-2.0.0a-win32.exe (will no longer work with older versions, unless you modify the. pro file, to include ther proper libraries and include paths). 35. john March 29, 2010 I would just like to ask how did you get the focal length Is it from the cameramatrix given by cvStereoCalibrate Which one did you use Fx or Fy for focal length I would also like to ask how did you get the disparity Is it the one that is being returned by cvFindStereoCorrespondenceBM then divided by 16 Sorry if I ask these questions because I am not getting an accurate result. ( I hope you can help me with this. 36. Fernando March 31, 2010 I use fx because disparity is measured in the x-axis. You should then divide the disparity from OpenCV by 16. And dont forget all the metrics from OpenCV matrixes are in pixels, so you will have to convert them into real units. Hope it helps you. 37. Fernando March 31, 2010 I forgot to say fx is from camera matrix and disparity map is from the stereoCorrespondence function. 38. john April 1, 2010 Thanks for your response. In your previous post you said f - focal length in pixels b baseline in CENTIMETERS (its used to convert from pixel world to cm world) d disparity in pixels (note that the disparity returned by Opencv is multiplied by 16, so you have to divide it for that in order to get the real disparity)8221 and eventhough I already converted all the pixel units to CM, I am still not getting the correct results. ( By the way, are you using Hartley8217s or Bouguet8217s algorithm in computing for the distance 39. Sh arad Shankar April 2, 2010 I8217ve been trying to compile your code. I8217m using the latest released QT SDK along with OpenCV 1.1Pre1a. I8217ve installed OpenCV at the location c:SDKOpenCV, so I wouldn8217t have to change the header and lib file locations. However, when I go to compile this program, I get the following error. Running build steps for project OpenCV-Qt-StereoVision8230 Starting: c:qt2010.02.1qtbinqmake. exe C:Documents and SettingsvcuDesktopOld stuffSeniorDesign2010(2)ShawnstereovisionOpenCV-Qt-StereoVision. pro - spec win32-g - r Exited with code 0. Starting: C:Qt2010.02.1mingwbinmingw32-make. exe - w mingw32-make: Entering directory C:Documents and SettingsvcuDesktopOld stuffSeniorDesign2010(2)Shawnstereovision8217 C:Qt2010.02.1mingwbinmingw32-make - f Makefile. Debug mingw32-make1: Entering directory C:Documents and SettingsvcuDesktopOld stuffSeniorDesign2010(2)Shawnstereovision8217 g - c - g - frtti - fexceptions - mthreads - Wall - DUNICODE - DQTLARGEFILESUPPORT - DQTDLL - DQTGUILIB - DQTCORELIB - DQTTHREADSUPPORT - DQTNEEDSQMAIN - I8221c:Qt2010.02.1qtincludeQtCore8221 - I8221c:Qt2010.02.1qtincludeQtGui8221 - I8221c:Qt2010.02.1qtinclude8221 - I8221c:SDKOpenCVcxcoreinclude8221 - I8221c:SDKOpenCVcvinclude8221 - I8221c:SDKOpenCVcvauxinclude8221 - I8221c:SDKOpenCVotherlibshighgui8221 - I8221c:Qt2010.02.1qtincludeActiveQ t8221 - I8221debug8221 - I8221.8221 - I8221c:Qt2010.02.1qtmkspecswin32-g8221 - o debugmain. o main. cpp mingw32-make1: Leaving directory C:Documents and SettingsvcuDesktopOld stuffSeniorDesign2010(2)Shawnstereovision8217 mingw32-make: Leaving directory C:Documents and SettingsvcuDesktopOld stuffSeniorDesign2010(2)Shawnstereovision8217 In file included from stereocamera. h:5, from mainwindow. h:5, from main. cpp:2: c:SDKOpenCVcxcoreincludecxmisc. h:133:6: error: elif with no expression mingw32-make1: debugmain. o Error 1 mingw32-make: debug Error 2 Exited with code 2. Error while building project OpenCV-Qt-StereoVision When executing build step 8216Make8217 I8217m not sure how to fix this error: elfif with no expression Please advise me on this problem, thank you very much. 40. Philip Dodson April 5, 2010 Had the same issue as you Sharad, but looking it up online, I replaced elif with else per this page ai. stanford. edu sgouldsvlfaq. html. I am now getting another error, however: 8220collect2: ld returned 1 exit status8221 apparently due to it saying RESULTOK and RESULTFAIL are called used without being defined around line 49. Not sure why it would say this, I am not too keen on C and am kind of confused by how the code is used here. Would greatly appreciate your help This is my compiler output: debugstereocamera. o:C:Documents and SettingsvcuDesktopOld stuffSeniorDesign2010(2)Sharadstarlino opencvstereovisionopencvstereovision-read-onlystereocamera. cpp:49: undefined reference to StereoCamera::RESULTOK8217 debugstereocamera. o:C:Documents and SettingsvcuDesktopOld stuffSeniorDesign2010(2)Sharadstarlino opencvstereovisionopencvstereovision-read-onlystereocamera. cpp:49: undefined reference to StereoCamera::RESULTFAIL8217 collect2: ld returned 1 exit status mingw32-make1: debugOpenCV-Qt-StereoCalibration. exe Error 1 mingw32-make: debug Error 2 Exited with code 2. Error while building project OpenCV-Qt-StereoVision When executing build step 8216Make8217 41. Starlino April 9, 2010 RESULTOK, RESULTFAIL are defined in stereocamera. h, static int const RESULTOK 0 static int const RESULTFAIL 1 you may change those constants with actual values, maybe the compiler version you8217re using is having problems getting into clas s constants, or maybe there8217s a inclusion problem with stereocamera. h. Anyways try replacing those values with 0 1. And if you still get errors for other things defined in stereocamera. h, then it8217s definitely a problem wit the include. so change return (captures0 038038 captures1). RESULTOK. RESULTFAIL return (captures0 038038 captures1). 0. 1 Let me know your findings. Please share the results with others. Thanks 42. Philip Dodson April 11, 2010 Changed RESULTOK to 0 and RESULTFAIL to 1 everywhere in stereocamera. cpp and it works perfectly This is going to save our lives for our senior design project Thank you Starlino, you are the man 43. PP April 18, 2010 I8217m doing a depth extraction research for my studies and i have some problems. I wrote a program using opencv which is working well on windows, but it only works with 1 usb webcam and 1 built in laptop working simultaneously, but they are too different, so the effects are poor. I can8217t get 2 usb webcams working together on windows (not even in other programs, not using opencv). So i tried to run the program on linux (Ubuntu 9.10) but now i have other problems, i cant get any 2 webcams to work together. They work ok separately, but when i try to use them together i get things like this img532.imageshack. usimg5322734beznazwygn. jpg 8230 Now i have only 2 weeks left for it and i can8217t get it working, so i thought maybe you have any stereo movie recorded (with images from 2 cams, one to another on one movie, or 2 movies, each from another cam, synchronised) with chessboard recorded, so it can be used for stereo calibration algorithm, and to depth extraction I found some stereo movie samples with other objects on it, but without callibration, estimated depth map isn8217t satisfactioning. If you have anything like this you could give me, or you can help me with using two webcams (code is allright, problem is somewhere else), i would apreciate it. Terima kasih. 44. Philip Dodson April 24, 2010 I hope my previous comments helped someone out there. But now I ask, has anyone successfully ran this in Visual Studio I need to get a depth map working in Visual Studio 2003, because I am using a library called Matrox Imaging Library, which the QT compiler seems to have a problem with. Also, all of my old code was written in Visual Studio, so it would be a pain to move it to QT creator. If anyone could provide an explanation of how to get it working in ANY version of Visual Studio, that would be somewhat helpful. Would it be possible for me to simply copy the code and take out all the QT interface stuff Semesters almost over8230running down to the wire, help would be very much appreciated, you know, per the usual. 45. tharindu May 24, 2010 I have managed to get through most of the compiling errors. but now it is exits with a exception, C:Documents and SettingsUOMDesktopDepthmapdebugOpenCV-Qt-StereoCalibration. exe exited with code -1073741515 ....Qt2010.02.1qtmkspecswin32-g8221 - DGNUC - DWIN32 mainwindow. h - o debugmocmainwindow. cpp g - c - g - frtti - fexceptions - mthreads - Wall - DUNICODE - DQTLARGEFILESUPPORT - DQTDLL - DQTGUILIB - DQTCORELIB - DQTTHREADSUPPORT - DQTNEEDSQMAIN - I8221........Qt2010.02.1qtincludeQtCore8221 - I8221........Qt2010.02.1qtincludeQtGui8221 - I8221........Qt2010.02.1qtinclude8221 - I8221........SDKOpenCVcxcoreinclude8221 - I8221........SDKOpenCVcvinclude8221 - I8221........SDKOpenCVcvauxinclude8221 - I8221........SDKOpenCVotherlibshighgui8221 - I8221........Qt2010.02.1qtincludeActiveQt8221 - I8221debug8221 - I8221.8221 - I8221........Qt2010.02.1qtmkspecswin32-g8221 - o debugmocmainwindow. o debugmocmainwindow. cpp g - enable-stdcall-fixup - Wl,-enable-auto-import - Wl,-enable-runtime-pseudo-reloc - mthreads - Wl - Wl,-subsystem, windows - o debugOpenCV-Qt-StereoCalibration. exe debugmain. o debugmainwindow. o debugstereovision. o debugstereocamera. o debugstereovisiontest. o debugmocmainwindow. o - L8221c:Qt2010.02.1qtlib8221 - lmingw32 - lqtmaind C:SDKOpenCVlibcxcore. lib C:SDKOpenCVlibcv. lib C:SDKOpenCVlibcvaux. lib C:SDKOpenCVlibhighgui. lib - lQtGuid4 - lQtCored4 mingw32-make1: Leaving directory C:Documents and SettingsUOMDesktopDepthmap8217 mingw32-make: Leaving directory C:Documents and SettingsUOMDesktopDepthmap8217 Exited with code 0. Any help would be greatly appreciated82308230. By the way im a QT newbie8230:) 46. tharinduwije May 25, 2010 stalino, the code is exsiting with 821608217 Starting C:Documents and SettingsUOMDesktopDepthmapdebugOpenCV-Qt-StereoCalibration. exe8230 C:Documents and SettingsUOMDesktopDepthmapdebugOpenCV-Qt-StereoCalibration. exe exited with code -1073741515 Running build steps for project OpenCV-Qt-StereoVision8230 Starting: C:Qt2010.02.1mingwbinmingw32-make. exe - w mingw32-make: Entering directory C:Documents and SettingsUOMDesktopDepthmap8217 C:Qt2010.02.1mingwbinmingw32-make - f Makefile. Debug mingw32-make1: Entering directory C:Documents and SettingsUOMDesktopDepthmap8217 mingw32-make1: Nothing to be done for first8217. mingw32-make1: Leaving directory C:Documents and SettingsUOMDesktopDepthmap8217 mingw32-make: Leaving directory C:Documents and SettingsUOMDesktopDepthmap8217 Exited with code 0. Configuration unchanged, skipping QMake step. Program is not running any idea 47. Gizmo June 3, 2010 From the sounds of it, the problem that I am having is the same as PP I am not able to use two USB cams at once. tharinduwije said that he was able to compile but not run the program, which is the current state that I am in whenever I try to use two external cameras. I can compile the program fine, with the same output that he has, but when I try to run the program using two USB cameras, it crashes every time, claiming that an incorrect size of input array (non-positive cols or rows) existed in function cvInitMatHeader. cxarray. cpp(182) I have one built-in webcam and two external USB cams. If I use my built-in cam and one of the USB cams, the program runs fine however, any time I have the program attempt to use both USB cams at the same time, I get that error. I am thinking that it may be a problem because I have both of the cameras on the same USB hub. The external cams are connected through my computer8217s USB ports, which are all part of the same single hub (hub 0), but my built-in webcam is a USB device on the hub that only contains built-in things (hub 1). If having the cams on the same hub prevents the stereovision from working, then that8217s probably my problem. However, rbha311 claimed to be having problems with limited USB bandwidth if having the cams on the same hub is only an issue because of the possibility of using too much bandwidth, I doubt that it8217s an issue for me. Though it8217s possible that I could have a similar problem, no messages have informed me of any problems from using too much bandwidth, and when I check during any other operation of the cameras and other USB devices simultaneously, there is no lack of bandwidth. Anyone understand this and have any ideas to fix it 48. Starlino June 3, 2010 To see if you cameras can be open at the same time try a different software, for example: For Windows check out DirectShow samples, that can be useful in troubleshooting the problem (might give you more info than the compiled software above): Knowing in advance that you cameras can stream at once is a good starting point. Also try USBDeview nirsoftutilsusbdevicesview. html to see if your cameras are actually detected, you can also check if they have a serial associated. Some drivers will get confused unless similar devices with same usb VIDPID have a serial number. I guess there8217s little you can do if you discover you can8217t have same model of camera attached at the same time, other than probably somehow route it through a different computer, or just get a new set of cameras. Also try to connect it to a different hub. Be aware that some USB ports on your computer belong to the same usb hub on the motherboard. 49. Gizmo June 4, 2010 I found out that my problem was due to the limited bandwidth available on my USB hub. I had verified before that I could have both cameras capturing video at the same time, and I had taken a look using USBDeview to see if there were any problems there. I also checked the bandwidth usage, but like I said in my last comment, I didn8217t think that was a problem. Saya salah. When the program tried to start both cameras, the camera that was started first would display it8217s image in one of the rightleft windows, and would take 69 of my available USB bandwidth. Then when the other one tried to activate, it only had access to 17 (my USB mouse was consuming the remaining 14). This was fine every time I tested having them active at the same time, and even capturing video from the both at the same time. However, it is evidently not enough for the stereo vision program to run effectively. As such, the rightleft window for the second camera would display no image, and the program would crash. I did finally get it working, though. I could not get my cameras to evenly distribute the available bandwidth 5050, but I did reduce how much they should be able to use. The most I could get them to do is have one take 57 of the available bandwidth and the other takes 43. I couldn8217t force them to go lower, nor could I force them to divide it evenly. However, this is enough that the program doesn8217t crash and the cameras are operating almost identically. 50. steven June 8, 2010 im trying to compile all of your project but in the end i got this eror result C:UsersStevenDesktopstereovissionOpenCV-Qt-StereoVisionstereocamera. cpp:29: error: 8216CVCAPDSHOW8217 was not declared in this scope is the problem within my openCV library if it is could you guide me through chaning my library to a correct one, because i still new in using opencv and Qt, 51. ugur June 16, 2010 firstly, thanks for this great job. But :) I8217m not able to run project :( Output: Starting C:UsersuurDesktopstereovisionstereo vision ExampledebugOpenCV-Qt-StereoCalibration. exe8230 Invalid parameter passed to C runtime function. Invalid parameter passed to C runtime function. C:UsersuurDesktopstereovisionstereo vision ExampledebugOpenCV-Qt-StereoCalibration. exe exited with code 3 Can I do something wrong Since I do not know anything for QT. I just downloaded, build and run it. 52. Simone June 27, 2010 HI, i have a problem, when i try the calibration IplImage StereoCamera::getFramesGray(int lr) if(frameslr) return 0 if(frameslr-depth 1) framesGraylr frameslr return frameslr else if(0 framesGraylr) framesGraylr cvCreateImage(cvGetSize(frameslr),IPLDEPTH8U,1) cvCvtColor(frameslr, framesGraylr, CVBGR2GRAY) return framesGraylr i recive a runtime error. in particular in this pointcvCvtColor(frameslr, framesGraylr, CVBGR2GRAY) the error is 8220the inferior stopped because it recived a signal from the operation system sig nal name: SIGSEGV signal meaming: Segmantation fault8221 can you help me 53. Luiz Henrique July 20, 2010 Having some troubles compilingfinding libraries. Platform: MacOS 10.6.4 My. pro file: (I have commented out all LIBS options, since none are working) Thanks for any help G 8212821282128212821282128212821282128212821282128212821282128212- Project created by QtCreator 2009-06-25T18:55:22 8212821282128212821282128212821282128212821282128212821282128212- TARGET OpenCV-Qt-StereoCalibration TEMPLATE app OpenCV LIBS optlocalliblibcv. dylib LIBS optlocalliblibcvaux. dylib LIBS - lcv LIBS - lcvaux - lhighgui - lml SOURCES main. cpp mainwindow. cpp stereovision. cpp stereocamera. cpp stereovisiontest. cpp HEADERS mainwindow. h stereovision. h stereocamera. h uimainwindow. h FORMS mainwindow. ui 59. sandy August 18, 2010 hiii first of alll thanks a lot for posting this project online, this helped me alot. i wanted to ask that i m using a single ccd camera which is capturing two images by using prism and mirrors. so the image which i am getting in camera is made up of two images left and right. for images it becomes very easy as i can crop images and the use them for matching. but if i have to make it real time hw can i do it. as i am looking for crop video softwares aswell but cant find anything. thanks a lot for helping me 60. starlino August 23, 2010 sandy, I think OpenCV has basic functionality for cropping an image, the camera function used in this software simply gets 2 8220Frame8221 objects that are images. In your case i guess you would get just one frame then use a ROI (region of interest) to extract the 2 images, see for example here nashruddinOpenCVRegionofInterest28ROI29 61. sandy August 24, 2010 thanks a lot starlino for helping me8230 i got that part by setting both capture to one camera and then using ROI on both of them. but another trouble is frames after roi are not coming to be 640215480 i have to resize them so that i dont have to makes in rest of files. i been searching methods to resize ipl images but still till now i havent got any luck, can u suggest me any appropriate method for this thank you. 62. sandy August 24, 2010 hiii when i am trying for calibration after 5 seconds completion softwares freezes and it is giving error of signal SIGSEGV and saying segmentation fault could you help me with this please thank you 63. santhosh chaitanya October 18, 2010 Hie , I an using QT sdk 4.7 version and opencv 2.1 and windows xp. when the compile the. pro file it compiles successfully when the programme runs, the error connecting to camerasfailed appears in the plainTextEdit. I have checked that both of my zebronic webcams are working perfectly fine. and also I tried increasing the index values in stereocamera. cpp nothing happens. I also tried to execute the program with test images provided in set 1 folder of the code folder. i followed the above said instructions If you don8217t have the cameras yet, but would like to test the sofware using the included images sets (see images folder). Open mainwindow. cpp and comment out timer. start(50) while uncommenting one of the 2 lines: stereoVisionTest(8220..imagesset18221,7,4) run test1 stereoVisionTest(8220..imagesset28221,9,6) run test2 when it complie the project it compiles successfully but some unexpected error occurs and the program crashes indicating as below C:OpenCV-Qt-StereoVision-build-desktopdebugOpenCV-Qt-StereoCalibration. exe exited with code -529697949 please help me out in this part. thnx in advance. 64. Iqra November 9, 2010 i am getting this error at build time..please tell me whats the issue . error: No rule to make target stereovision. cpp8217, needed by tmpobjdebugsharedstereovision. o8217. Berhenti. 65. Iqra November 11, 2010 i am getting this error at run time Starting C:Qt2010.05qtOpenCV2.0OpenCV-Qt-StereoVision-build-desktopdebugOpenCV-Qt-StereoVision. exe8230 C:Qt2010.05qtOpenCV2.0OpenCV-Qt-StereoVision-build-desktopdebugOpenCV-Qt-StereoVision. exe exited with code -1073741515 66. Stereopsis November 22, 2010 I had a problem when i did calibration by using opencv library as your suggestion. I try to calibrate with farther distance(20m) and larger chessboard (2 x 1 meter). The library can detect the corners for left and right images, but it can not generate rectified map correctly. Do you have any suggestion for my situation thanks in advance for your reply. 67. santhosh chaitanya December 1, 2010 Hie everyone , I am using QT sdk 4.7 version and opencv 2.1 and windows xp. when the compile the. pro file it compiles successfully when the programme runs, the error connecting to camerasfailed appears in the plainTextEdit. I have checked that both of my zebronic webcams are working perfectly fine. and also I tried increasing the index values in stereocamera. cpp nothing happens. I also tried to execute the program with test images provided in set 1 folder of the code folder. i followed the above said instructions If you dont have the cameras yet, but would like to test the sofware using the included images sets (see images folder). Open mainwindow. cpp and comment out timer. start(50) while uncommenting one of the 2 lines: stereoVisionTest(..imagesset1,7,4) run test1 stereoVisionTest(..imagesset2,9,6) run test2 when it complie the project it compiles successfully but some unexpected error occurs and the program crashes indicating as below C:OpenCV-Qt-StereoVision-build-desktopdebugOpenCV-Qt-StereoCalibration. exe exited with code -529697949 please help me out in this part. please suggest me which version of opencv and QT to use to get the program compiled successfully. I am stuck at this point from many days. please help me out8230 68. Erkable December 2, 2010 What model cameras are you using
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