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Aphex 188 Instruction Manual
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Aphex 188 Instruction Manual

Remote controlled 8 channel microphone preamplifier
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Model 188

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Summary of Contents for Aphex 188

  • Page 1 Model 188...
  • Page 2 Instruction Manual P/N 188-3200 Preliminary Rev 1 Released 01/23/09 Manufactured by Aphex Systems Ltd. 11068 Randall St. Sun Valley, CA 91352 Copyright 2009 Aphex Systems Ltd. All rights reserved. Produced by Wayne LaFarr Aphex Systems Ltd. Model 188 Page 1...
  • Page 3 The Model 188 was designed primarily as an integral part of the Anaconda Digital Snake System. Our listening tests as well as tests by respected engineers have confirmed that the Model 188 is an excellent sounding pre- amplifier in its own right. The value of it is so much higher because it is so easily remote controllable. It can be controlled by the Model 1788AR-C hardware remote controller, PC or MAC software.
  • Page 4 Table of Contents 1.Introduction 2.Quick Start Front Panel LCD Display and Rotary Encoder/Switch Front Panel Screens 3. Rear Panel 4. Model 188 block diagram and signal flow 5. Installation 6. Functions in Detail Aphex Systems Ltd. Model 188 Page 3...
  • Page 5 500Ω. The sonic effects are reduced frequency and transient response, and higher noise. The increase in audio quality when the microphone is driving an ideal load is dramatic. The 188 acts like an active splitter with one analog and two digital outputs..

  • Page 6: Quick Start

    Start Up The first screen shows the firmware version that is loaded into the Model 188. It is a good idea to check the Aphex website occasion- ally to see if there are any updates. Updating the firmware is cov- ered in section---- Aphex Systems Ltd.
  • Page 7 Channel number, gain, status for Polarity Reverse, Pad, Low Cut Filter, and Phantom Power functions. A check mark under the function indicates that it is active. A dash indicates that it is not active. The Input Gain is adjustable from 26 to 65dB. Aphex Systems Ltd. Model 188 Page 6...
  • Page 8 (44.1, 48, SMUX 44.1, SMUX 48, SMUX 88.2 or SMUX 96kHz). The rate that is selected will appear on the Word Clock output. If the source is set to External, the sample rate will appear in the screen if there is a valid clock input. Aphex Systems Ltd. Model 188 Page 7...
  • Page 9 IP is selected. The fixed IP addresses range from 192.168.1.64 for Net Number 001 to 192.168.1.192 for Net Number 128. If these addresses are not compatible with your network, please contact Aphex. Note: Power must be cycled off and on to commit these changes.
  • Page 10 8) when SMUX is not selected. When SMUX is selected ADAT Output 1 will have audio channels 1, 2, 3 and 4; and ADAT Output 2 will have audio channels 5, 6, 7 and 8. Aphex Systems Ltd. Model 188 Page 9...
  • Page 11 Standard RJ-45 connector for Ethernet remote control as well as for future downloads of firmware. POWER Standard IEC receptacle. The Model 188 has a switch mode power supply which can accept any voltage from 90 to 260VAC and at either 50 or 60Hz. GROUND LUG Provides solid grounding point.
  • Page 12 Simplifi ed Block Diagram Signal Flow The microphone signal enters the Model 188 through the female XLR, through a switch for the Pad (-26dB), the mic pre front end including the transformer with 26dB of gain and the low cut fi lter, polarity reverse, through the variable gain amplifi er (0 to 39dB of gain), to the A/D converter and the output stage.
  • Page 13 The Model 188 occupies 1RU (45mm or 1.75 inches) of a standard EIA equipment rack. Allow at least an additional 3” to 4” of depth for connectors. Place the Model 188 in the desired rack space and secure with the cushioned rack screws or equivalent hardware. Don’t position the Model 188 directly above power amplifiers or power supplies that produce strong hum fields or heat.
  • Page 14 Ground loops hardly ever cause problems within the 188 since it was designed with high immunity. However, other equipment connected to the 188 may experience hum and noise from a ground loop. Ground loops can occur when various interconnected equipment is powered from separate AC circuits that are fed from opposite phases of the power feeder.
  • Page 15 4. At the end of a successful 188 download, the computer screen will show the message: “End of Load”. 5. Cycle the 188’s power off and on. Verify that the new firmware version is now shown at the bottom right of the LCD screen..
  • Page 16 Remove the top cover and locate the jumper for each preamp behind the DB-25 connector.. Move the jumper to the appropriate position. Enlarged image with jumpers on Post for channels 7 and 8 Page 15 Aphex Systems Ltd. Model 188...

  • Page 17: Functions In Detail

    10dB. Even a 3dB step, up or down, in a microphone preamp will cause an audible click or pop when it is changed. The Aphex 1788A and the 188 use different but equally effective circuitry to eliminate pops and clicks and zipper noise. This is especially appreciable when you have to roll through a gain change of 6dB or more very quickly.
  • Page 18 ADAT or SMUX by rotating the encoder to the desired format and pressing the encoder to select. Note: When 44.1 or 48kHz is selected with SMUX format, the effective sampling rate will be double (88.2 or 96kHz). Page 17 Aphex Systems Ltd. Model 188...

  • Page 19: Limited Warranty

    EXCLUSION OF CERTAIN DAMAGES Aphex Systems’ liability for any defective unit is limited to the repair or replacement of said unit, at our option, and shall not include damages of any other kind, whether incidental, consequential, or otherwise.
  • Page 20 Aphex Systems Ltd. 11068 Randall St. Sun Valley, CA 91352, U.S.A. Tel: (818) 767-2929 Fax: (818) 767-2641 Web: www.aphex.com Email sales@aphex.com, techsup@aphex.com Email sales@aphex.com, techsup@aphex.com...