dbx Proメーカー376の使用説明書/サービス説明書
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® 376 V acuum T ube Channel Strip w/Digital Out User Manual.
WARNING FOR YOUR PROTECTION PLEASE READ THE FOLLOWING: KEEP THESE INSTRUCTIONS HEED ALL WARNINGS FOLLOW ALL INSTRUCTIONS CLEAN ONLY WITH A DAMP CLOTH. DO NOT BLOCK ANY OF THE VENTILATION OPENINGS. INSTALL IN ACCORDANCE WITH THE MANUFACTURERS INSTRUCTIONS.
U.K. MAINS PLUG WARNING A molded mains plug that has been cut off from the cord is unsafe. Discard the mains plug at a suitable disposal facility . NEVER UNDER ANY CIRCUMSTANCES SHOULD YOU INSERT A DAMAGED OR CUT MAINS PLUG INTO A 13 AMP POWER SOCKET.
T able of Contents 376 Intr oduction 0.1 Defining the 376................................................i 0.2 Service Contact Info .........................................ii 0.3 W arranty ............................................................ii 0.
INTRO CUSTOMER SER VICE INFO 376 DEFINED W ARRANTY INFO ® INTRODUCTION 376.
Intr oduction ® 376 User Manual i 376 Congratulations on your purchase of the dbx 376 V acuum Tube Channel Strip with digital capa- bilities. For over 25 years, dbx has been the industry leader in dynamics processing. With the introduction of the 376, the standard for channel strip processors has now been completely redefined.
® Intr oduction 376 376 User Manual If you require technical support, contact dbx Customer Service. Be prepared to accurately describe the problem. Know the serial number of your unit.
Intr oduction ® 376 User Manual iii 376 FOR RACK MOUNT USE ONL Y - Install the 376 in your rack with the provided rack screws. When installed in a rack, the unit should be positioned with enough room (at least one 1U above the and 1U below the unit) to allow proper ventilation.
Getting Started ® Getting Started Section 1 376.
Getting Star ted ® 376 User Manual 2 Section 1 376 P o wer Switch Turns the 376 on and off. IEC P o wer Cor d Receptacle This is the power cord receptacle of the 376.
® Instrument Input This unbalanced high-impedance input connection is used to insert an instrument signal direct- ly into the preamp. Use the LINE switch to make instrument input or the rear panel line input active. Plugging into the instrument jack will override the rear panel 1/4” input jack (line input must be selected).
Getting Star ted ® 376 User Manual 4 Section 1 376 Lo w control This control varies the gain of the low frequency equalization; the gain range is -15 to +15 dB. This filter is a low shelving filter at 80 Hz. Mid contr ol This control varies the gain of the mid frequency equalization; the gain range is -15 to + 15 dB.
® Output Le vel This knob controls the overall level of the output signal, and ranges from -20 to +20dB. Meter Select Switch This switch allows you to select display metering of either the digital or analog output signal. The analog level is scaled in dBu, while the digital level is scaled in dBFS.
Getting Star ted ® 6 Section 1 376.
ANALOG APPLICA TIONS ® ANALOG APPLICA TIONS Section 2 376.
Analog Applications ® 3 376 User Manual 8 Section 2 376 • Turn off all equipment before making any connections. • Install the 376 in your rack with the provided rack screws.
® 3). Turn the 376’s DRIVE control to the minimum position. Turn the OUTPUT LEVEL control to the 12 o’clock position, and apply power to the 376. Make sure your console’s gain fader is at the nominal level and begin to slowly increase the gain of the 376 using the DRIVE control.
Analog Applications ® 376 User Manual 10 Section 2 376 3). Enable the record function of the specific track of the recorder and open the specific tape track return in the console which corresponds to the track to which the 376 is connected.
DIGIT AL APPLICA TIONS ® DIGIT AL APPLICA TIONS Section 3 376.
Dither Switch This switch is used to select the dither type algorithms including: TPDF , SNR 2 , or None. Dither is random noise that is added to the audio signal which effectively eliminates the harmonic dis- tortion created by truncation. See the“T runcation” graph in section D.
AES/EBU Digital Connector T he 376 pr o vi d es AES / EB U di gi t al o ut pu t f or m at t i ng t hr o ugh t he X LR connect or . B e s ur e t o use s ho r t l engt hs of 110 Ω d ig ita l ca b le s ra th e r th a n s ta n d a rd X L R to X L R ca b le s.
Rear P anel Connections • Connect the source to the desired 1/4” TRS or XLR input. • Connect the AES/EBU or S/PDIF output of the 376 and run into the AES/EBU or S/PDIF input interface of the DA W (CPU). Fr ont P anel Digital Output F eatures 1).
Rear P anel Connections • Connect the source to the desired 1/4” TRS or XLR input jack. • Connect the AES/EBU or S/PDIF output of the 376 and run into the AES/EBU or S/PDIF input of the digital mixer . Fr ont P anel Digital Output F eatures 1). Use the METER switch to select digital output metering.
Rear P anel Connections • Connect the source to the desired 1/4” TRS or XLR input. • Connect the AES/EBU or S/PDIF output of the 376 and run into the AES/EBU or S/PDIF input interface of the DA W (CPU). Fr ont P anel Digital Output F eatures 1).
Rear P anel Connections • Connect the source to the desired 1/4” TRS or XLR input jack. • Connect the AES/EBU or S/PDIF output of the 376 and run into the AES/EBU or S/PDIF input of the digital mixer . Fr ont P anel Digital Output F eatures 1). Use the METER switch to select digital output metering.
The 376 gives you the unique option of utilizing the analog and digital outputs simultaneously. This option is ideal for using the analog output section as a reference monitoring signal of the dig- ital signal.
APPENDIX Sync Input Info Block Diagram dbx T ype IV™ White Paper Noise-Shaping Algorithms T runcation Specifications ® APPENDIX Appendix 376.
Appendix A A- Sync Input Info INSTRUCTIONS FOR QUALIFIED SERVICE PERSONNEL: CAUTION : These servicing instructions ar e for use by qualified service personnel only. T o r educe the risk of electric shock, do not per form any servicing other than that contained in the operating instructions unless you are qualified to do so.
Microphone Input +48V Over easy“ Slow 20dB Pad Phase In vert Low Cut dbx TYPE IV Conversion System DSP Dither Sample Rate Wo r d Length Output Format Shape Peak LEDs EQ Clip LED Threshold LED De-Ess.
Appendix C dbx T ype IV™ Con v ersion System White P aper b y Ro ger Johnson The dbx Type IV™ Conversion System is a proprietary analog-to-digital (A/D) conversion process that combines the best attributes of digital conversion and analog recording processes to preserve the essence of the analog signal when it is converted to a digital format.
to-noise perfor mance since the signal is now closer to the noise floor . Because users of digital equipment have to be extremely careful not to exceed 0 dB FS (full-scale), they must use peak-reading headroom meters.
Appendix C Fig. 2 illustrates the mapping function in a different way. Input levels are shown on the left of the graph, while con- verted levels are shown on the right. Notice the mapping of large signal excursions to the 4 dB “Type IV™ Over Region.
Figure 3b - Signal of Fig. 3a Going Beyond the A/D Clip Lev el Amplitude Time A/D Clip Lev el A/D Clip Lev el Figure 3a - Signal Having Low and High F requency Content Amplitude Time Appendix C ® App.
Appendix C Now you’re probably wondering, “What’s the catch? I can’t get something for nothing so what did I give up?” Y ou may be worried that your A/D noise floor got 4 dB worse because we borrowed the top 4 dB of your converter . This is certainly a valid concern.
16-Bit TPDF dither . (a) Shape “off”, (b) with shape set to “S1”, (c) with shape set to “S2.” Parameters: Input -60dBFS, 1 kHz; FFT Length= 2048, Sample Rate= 48 Khz, A verages= 32; Graph Steps= 1024. (a) 24-Bit word, (b) 16-Bit truncated output, no dither .
Appendix D Microphone Input Connec t or: Fe m al e XLR Pi n 2 H ot T y p e : E le c t ro n ica lly b a la n c e d /u n b a la n c e d I m ped anc e: 330 Ω M axi m um I nput Le vel : - 9 dBu or + 11 .
® 8760 South Sandy Pkwy . Sandy , Utah 84070 Phone: (801) 568-7660 F ax: (801) 568-7662 Int’l F ax: (603) 672-4246 Questions or comments? E•mail us at: customer@dbxpro .
デバイスdbx Pro 376の購入後に（又は購入する前であっても）重要なポイントは、説明書をよく読むことです。その単純な理由はいくつかあります：
dbx Pro 376をまだ購入していないなら、この製品の基本情報を理解する良い機会です。まずは上にある説明書の最初のページをご覧ください。そこにはdbx Pro 376の技術情報の概要が記載されているはずです。デバイスがあなたのニーズを満たすかどうかは、ここで確認しましょう。dbx Pro 376の取扱説明書の次のページをよく読むことにより、製品の全機能やその取り扱いに関する情報を知ることができます。dbx Pro 376で得られた情報は、きっとあなたの購入の決断を手助けしてくれることでしょう。
dbx Pro 376を既にお持ちだが、まだ読んでいない場合は、上記の理由によりそれを行うべきです。そうすることにより機能を適切に使用しているか、又はdbx Pro 376の不適切な取り扱いによりその寿命を短くする危険を犯していないかどうかを知ることができます。
ですが、ユーザガイドが果たす重要な役割の一つは、dbx Pro 376に関する問題の解決を支援することです。そこにはほとんどの場合、トラブルシューティング、すなわちdbx Pro 376デバイスで最もよく起こりうる故障・不良とそれらの対処法についてのアドバイスを見つけることができるはずです。たとえ問題を解決できなかった場合でも、説明書にはカスタマー・サービスセンター又は最寄りのサービスセンターへの問い合わせ先等、次の対処法についての指示があるはずです。
