Aphex 1788A Instruction Manual

Download or browse on-line these Instruction Manual for Aphex 1788A Music Equipment, Processor.

Aphex 1788A Manual Information:

This manual for Aphex 1788A, given in the PDF format, is available for free online viewing and download without logging on. The guide contains 50 pages, and the size of the file at download is 4.16 Mb. The document type is Instruction Manual.

Download Manual

More Manuals:

In case you failed to obtain relevant information in this document, please, look through related operating manuals and user instructions for Aphex 1788A. Just click one of the links below to go to the selected manual:

Summary of Contents:

[Page 1] Aphex 1788A

IMPORTANT NOTICE This manual contains valuable information you will need to install and use the 1788A. A separate remote control manual has been created to deal with remotely controlling the 1788A, use of the PC and Mac software,...

[Page 2] Aphex 1788A

Page 2 MICROPHONE PREAMPLIFIER Page 3 Instruction Manual CONTENTS A MESSAGE FROM THE PRESIDENT Dear Aphex Customer, Congratulations on your purchase of the Model 1788A remote controlled microphone preamplifier. Years of research and development were...

[Page 3] Aphex 1788A

Page 2 MICROPHONE PREAMPLIFIER Page 3 Instruction Manual CONTENTS 1. INTRODUCTION – 4 1.1 LOGICAL CONTROL BLOCKS — 4 1.2 PATENTED TECHNOLOGY — 4 1.3 SIGNAL & CONTROL — 4 1.4 SIMPLIFIED BLOCK DIAGRAM — 5 2. QUICK START – 6 ...

[Page 4] Aphex 1788A

Page 4 MICROPHONE PREAMPLIFIER Page 5 Instruction Manual 1. INTRODUCTION 1. INTRODUCTION The Aphex Model 1788A is a premium 8-channel remote controlled microphone preamplifier with sophisticated features. Remote control means the p...

[Page 5] Aphex 1788A

Page 4 MICROPHONE PREAMPLIFIER Page 5 Instruction Manual 1. INTRODUCTION Optional Digital I/O When the optional digital audio output module is installed, three 8-channel simultaneous digital outputs are available: 1. Alesis ADAT® Output, Optical Fi...

[Page 6] Aphex 1788A

Page 6 MICROPHONE PREAMPLIFIER Page 7 Instruction Manual 2. QUICK START 1. CHANNEL SELECT buttons select one of eight channels for local control. 2. CHANNEL STATUS READOUT displays input gain and maximum output settings; function status...

[Page 7] Aphex 1788A

Page 6 MICROPHONE PREAMPLIFIER Page 7 Instruction Manual 2. QUICK START AUX OUTPUT CH 8 MIC IN LINE OUT CH 7 MIC IN CH 6 MIC IN CH 5 MIC IN CH 4 MIC IN CH 3 MIC IN CH 2 MIC IN CH 1 MIC IN MODEL 1788A - 8 Channel Mic Pre Aphex Systems Sun Valley, CA ...

[Page 8] Aphex 1788A

Page 8 MICROPHONE PREAMPLIFIER Page 9 Instruction Manual 2. QUICK START 2.3 GETTING UP & RUNNING Here’s a step by step instruction on using the 1788A. Please plug a microphone into Channel 1 and connect the CH1 Main Output to a mixer or reco...

[Page 9] Aphex 1788A

Page 8 MICROPHONE PREAMPLIFIER Page 9 Instruction Manual 2. QUICK START to your equipment and that our MIcLim protection will indeed protect you from clipping your gear. If you don’t know the MIL of your input, then use your mixer or recorder’s...

[Page 10] Aphex 1788A

Page 10 MICROPHONE PREAMPLIFIER Page 11 Instruction Manual 3. INSTALLATION 3. INSTALLATION 3.1 UNPACKING AND INSPECTING Your Aphex product was carefully inspected and packaged at the factory prior to shipment. The carton and packing materials are de...

[Page 11] Aphex 1788A

Page 10 MICROPHONE PREAMPLIFIER Page 11 Instruction Manual 3. INSTALLATION Ground Loops Ground loops hardly ever cause problems within the 1788A since it was designed with high immunity. However, other equipment connected to the 1788A may experience...

[Page 12] Aphex 1788A

Page 12 MICROPHONE PREAMPLIFIER Page 13 Instruction Manual 3. INSTALLATION This connector pinout matches the Tascam Analog DB-25 connector that has also been adopted by many other manufacturers such as Mackie and Yamaha. Ready made cables can be pu...

[Page 13] Aphex 1788A

Page 12 MICROPHONE PREAMPLIFIER Page 13 Instruction Manual 3. INSTALLATION 3.9 COM PORT This is a standard RS-232 Com Port that runs at a fixed 9600 Baud. It is provided to allow downloading of new firmware into the 1788A. It has no other purpose. R...

[Page 14] Aphex 1788A

Page 14 MICROPHONE PREAMPLIFIER Page 15 Instruction Manual 4. FUNCTIONS IN DETAIL EXAMPLE OF USING PRE MODE The FOH position has control over the 1788A’s but the monitor position doesn’t want to be affected by the FOH’s gain changes. In this c...

[Page 15] Aphex 1788A

Page 14 MICROPHONE PREAMPLIFIER Page 15 Instruction Manual 4. FUNCTIONS IN DETAIL 4. FUNCTIONS in DETAIL 4.1 LOCAL BLOCK Channel Select and Channel Status Readout Select LOCAL CONTROL and use the CHANNEL SELECT buttons to choose one of eight channe...

[Page 16] Aphex 1788A

Page 16 MICROPHONE PREAMPLIFIER Page 17 Instruction Manual 4. FUNCTIONS IN DETAIL NOTE: The gain does not move in 1dB steps. It ramps in small increments (1/4dB steps) between 1dB “stops” to eliminate all gain adjustment glitches. This brings u...

[Page 17] Aphex 1788A

Page 16 MICROPHONE PREAMPLIFIER Page 17 Instruction Manual 4. FUNCTIONS IN DETAIL channels is muted. The channel or channels that have been muted will flash double dash marks in the Gain display of the individual channel status readout to indicate t...

[Page 18] Aphex 1788A

Page 18 MICROPHONE PREAMPLIFIER Page 19 Instruction Manual 4. FUNCTIONS IN DETAIL Enable Limiter Enabling the LIMITER engages the proprietary Microphone Output Limiter (MicLim™) which virtually eliminates the possibility of input o...

[Page 19] Aphex 1788A

Page 18 MICROPHONE PREAMPLIFIER Page 19 Instruction Manual 4. FUNCTIONS IN DETAIL Once the Adjust/Store button is lighted, you are committed to a new store. You can use the ADJUST dial to change the displayed number to what is wanted. Pressing the ...

[Page 20] Aphex 1788A

Page 20 MICROPHONE PREAMPLIFIER Page 21 Instruction Manual 4. FUNCTIONS IN DETAIL Local Control The LOCAL button allows front panel control. Press it once, you’re in local. Press it again, you’re back in remote. The LOCAL button is lighted when ...

[Page 21] Aphex 1788A

Page 20 MICROPHONE PREAMPLIFIER Page 21 Instruction Manual 4. FUNCTIONS IN DETAIL Sample Rate The RATE button toggles through the three available sample rates of 32, 44.1, 48, or 96KHz when running the 1788A on internal clock only. 4....

[Page 22] Aphex 1788A

Page 22 MICROPHONE PREAMPLIFIER Page 23 Instruction Manual 5. USING THE DIGITAL MODULE typically is where you want to set your 0VU reference, or average operating level of all following equipment. The Gain indicators in the individual channel statu...

[Page 23] Aphex 1788A

Page 22 MICROPHONE PREAMPLIFIER Page 23 Instruction Manual 5. USING THE DIGITAL MODULE 5. USING THE DIGITAL MODULE When you have the 1788A’s digital audio option installed, you have a very versatile digital front end for any digital recorder, mixe...

[Page 24] Aphex 1788A

Page 24 MICROPHONE PREAMPLIFIER Page 25 Instruction Manual 5. USING THE DIGITAL MODULE BNC Clock I/O The sync capability is made even more flexible by providing a feed-through port. When in external sync mode, the BNC output jack is tied directly to...

[Page 25] Aphex 1788A

Page 24 MICROPHONE PREAMPLIFIER Page 25 Instruction Manual 5. USING THE DIGITAL MODULE Remote Clock Mastering Depending on your system design, you may need to sync one or more 1788A’s to an existing clock source. That is made simple...

[Page 26] Aphex 1788A

Page 26 MICROPHONE PREAMPLIFIER Page 27 Instruction Manual 5. USING THE DIGITAL MODULE Variations As you can see, clocking is usually pretty simple. Sometimes, especially with the use of many channels and multiple 1788A’s, you may need to ...

[Page 27] Aphex 1788A

Page 26 MICROPHONE PREAMPLIFIER Page 27 Instruction Manual 5. USING THE DIGITAL MODULE BRIEF TUTORIAL BRUTE FORCE AND IMPEDANCE MATCHED TRANSMISSION BACKGROUND Synchronization of digital audio equipment shouldn’t be a problem but it is. All the pro...

[Page 28] Aphex 1788A

Page 28 MICROPHONE PREAMPLIFIER Page 29 Instruction Manual 6. TYPICAL OPERATION 5.2 SENDING DIGITAL AUDIO The digital module provides three simultaneous 8-channel outputs: 1. Four AES/EBU 110 ohm pairs on a 15-pin D-Sub 2. ADAT® Optical on a TOSLINK...

[Page 29] Aphex 1788A

Page 28 MICROPHONE PREAMPLIFIER Page 29 Instruction Manual 6. TYPICAL OPERATION 6. TYPICAL OPERATION This section suggest ways to get the most out of your Model 1788A. Let these ideas serve as inspiration more than instruction. ...

[Page 30] Aphex 1788A

Page 30 MICROPHONE PREAMPLIFIER Page 31 Instruction Manual 6. TYPICAL OPERATION NOTE: You may run into issues of balanced and unbalanced inserts. The 1788A can drive both types just as easily. You can refer to this manual’s appendix on proper wiri...

[Page 31] Aphex 1788A

Page 30 MICROPHONE PREAMPLIFIER Page 31 Instruction Manual 6. TYPICAL OPERATION optional digital module, you can use the AES/EBU DB-15 digital output, the DB-25 TDIF (Tascam type) or the ADAT optical output to route all eight channels directly to th...

[Page 32] Aphex 1788A

Page 32 MICROPHONE PREAMPLIFIER Page 33 Instruction Manual 6. TYPICAL OPERATION 6.4 USING THE MICROPHONE OUTPUT LIMITER Microphone limiters traditionally consist of a mic preamp followed by a limiter circuit. Until MicLim was devised, th...

[Page 33] Aphex 1788A

Page 32 MICROPHONE PREAMPLIFIER Page 33 Instruction Manual 6. TYPICAL OPERATION Changing the polarity of one or more mics will often clear up the problem. It is always worth the time to experiment with mic polarity. 6.6 GROUPING CHANNELS It is poss...

[Page 34] Aphex 1788A

Page 34 MICROPHONE PREAMPLIFIER Page 35 Instruction Manual 8. SPECIFICATIONS 7.2 SERVICE INFORMATION If it becomes necessary to return this unit for repair, you must first contact Aphex Systems, Ltd. for a Return Authorization (RMA number), which wi...

[Page 35] Aphex 1788A

Page 34 MICROPHONE PREAMPLIFIER Page 35 Instruction Manual 8. SPECIFICATIONS 8.1 GENERAL SPECIFICATIONS 8. Specifications ANALOG OUTPUTS Connector: Type: Output Z Balanced: Output Z Unbalanced: Nominal Level Maximum Output Level (MOL): Main Out: 8 e...

[Page 36] Aphex 1788A

Page 36 MICROPHONE PREAMPLIFIER Page 37 Instruction Manual APPENDIX A 8.2 ARCHITECT’S SPECIFICATIONS Basic Description A multichannel microphone preamplifier comprising eight identical channels that are both locally controllable and remot...

[Page 37] Aphex 1788A

Page 36 MICROPHONE PREAMPLIFIER Page 37 Instruction Manual APPENDIX A lines are the same. They both need two conductors. What makes a system unbalanced is when one of the wires is formed into a tube that wraps around the other con...

[Page 38] Aphex 1788A

Page 38 MICROPHONE PREAMPLIFIER Page 39 Instruction Manual APPENDIX B & C 1 illustrates how the hum is induced into both wires equally and therefore is cancelled out. Since the balanced line has wires that are twisted together, each ...

[Page 39] Aphex 1788A

Page 38 MICROPHONE PREAMPLIFIER Page 39 Instruction Manual APPENDIX B & C lem of a ground loop. First is to eliminate it from its source, and the second is to re-route it through another path. The third is to balance out your unbal- a...

[Page 40] Aphex 1788A

Page 40 MICROPHONE PREAMPLIFIER Page 41 Instruction Manual APPENDIX D CONNECTOR WIRING STANDARDS The 3 pin XLR, 1/4” (63.5 mm) TS mono phone and the 1/4” (63.5 mm) TRS stereo phone are the most commonly used line level connectors in pro ...

[Page 41] Aphex 1788A

Page 40 MICROPHONE PREAMPLIFIER Page 41 Instruction Manual APPENDIX D A word on impedance and interfacing adapt- ers: If you are connecting between two line level devices and they have different connectors (example: 1/4” phone to XL...

[Page 42] Aphex 1788A

Page 42 MICROPHONE PREAMPLIFIER Page 43 Instruction Manual APPENDIX D PART 1: BALANCED OUT to BALANCED IN OK for Microphones Standard store-bought cable. Shield grounded at both ends. Positives: Good for microphones. Negatives: May cause ground loop...

[Page 43] Aphex 1788A

Page 42 MICROPHONE PREAMPLIFIER Page 43 Instruction Manual APPENDIX D PART 2: BALANCED OUT to UNBALANCED IN It was mentioned that there are several types of balanced output stages in use today. The follow- ing diagrams show you how to properly unbal...

[Page 44] Aphex 1788A

Page 44 MICROPHONE PREAMPLIFIER Page 45 Instruction Manual APPENDIX E Stereo Plug Male XLR Female XLR Don’t Connect Pin 3 Ground Shield This End Only Ground Shield This End Only To TRS Insert Jack To Equipment Input From Equipment Output Tip Ring S...

[Page 45] Aphex 1788A

Page 44 MICROPHONE PREAMPLIFIER Page 45 Instruction Manual APPENDIX E APPENDIX E: HELPFUL WIRING TABLE Also see next page... Cross- Coupled Balanced (Aphex Servo Balanced) POSITIVE (HIGH) TABLE 2 - - TYPES OF ACTIVE BALANCED INPUT/OUTPUT CIRCUITS &a...

[Page 46] Aphex 1788A

Page 46 MICROPHONE PREAMPLIFIER Page 47 Instruction Manual APPENDIX F NOTES The following notes are referenced in the text and in Table 2 on the preceding pages. Note 1: ADDITIONAL READING SUGGESTIONS: Sound System Engineering by Don Davis and Caroly...

[Page 47] Aphex 1788A

Page 46 MICROPHONE PREAMPLIFIER Page 47 Instruction Manual APPENDIX F APPENDIX F: WORD CLOCK CABLING Transmission Systems There are basically two systems in use for distributing word clock by coaxial lines: 75Ω matched, and unmatched with unspeci...

[Page 48] Aphex 1788A

Page 48 MICROPHONE PREAMPLIFIER Page 49 Instruction Manual APPENDIX F not terminated in its characteristic impedance. In most cas- es, unmatched word clock lines are driven by a low output impedance voltage driver and loaded by a high impedance rec...

[Page 49] Aphex 1788A

Page 48 MICROPHONE PREAMPLIFIER Page 49 Instruction Manual APPENDIX F NOTE ON CONVERTING TO A MATCHED LINE: because of the 1788A’s automatic input level adap- tation, you can convert a brute forced clock source into a workable matche...

[Page 50] Aphex 1788A

Page 50 MICROPHONE PREAMPLIFIER This product is protected under one or more of the following Aphex patents. 4,578,648 4,633,501 4,843,626 4,939,471 5,115,471 5,155,769 5,334,947 5,359,665 5,422,602 5,424,488 5,450,034 5,463,695 5,483,600 5,485,077 5,...