Aphex 1788A Microphone Preamp

Aphex 1788A - 8 Channel Remote Controlled Microphone Preamplifier

Aphex 1788A - 8 Channel Remote Controlled Microphone Preamplifier

B&H # AP1788A MFR # 1788A
No Longer Available

Aphex 1788A overview

  • 1Description

The 1788A from Aphex is an eight channel, remote controlled microphone preamp that addresses many of the noise issues that plague preamps. These include long microphone level cables, splitters and multiple inputs that reduce the sensitivity of the microphone and change its frequency, phase and transient response.

By placing the 1788A close to the microphones and controlling it remotely, the need for long cable runs is eliminated. Phantom power on a microphone line also causes the line itself to become a microphone. Having the phantom power source as close as possible to the microphone reduces the chance of phantom voltage loss within a very long cable run.

The unit can provide up to five outputs per channel (two analog and three digital via an optional digital output card,) all available simultaneously, thus essentially eliminating the need for splitter boxes. A built-in limiter in the front-end of the preamp provides protection against overloading the preamp.

Eight remote controllable, Jensen transformer-coupled microphone preamps in a 2U rack-mount chassis
Limiter in the front end of the preamp limits the output level of the microphone by as much as 20dB. This allows the engineer to get maximum noise performance and also allows maximum resolution for an analog to digital converter, all without worrying about crashing the preamp
A 26dB pad allows a preamp to be run as a unity gain buffer stage. This allows the line level output of a wireless mic receiver to be fed into the preamp
Output level trims of up to 24dB. Once the maximum input level of the device following the 1788A is defined, the output level of can be trimmed to that exact level. The input gain of the 1788A is then adjusted to achieve optimum performance. In addition to the 24db of output adjustment, each output may be muted
Two separately trimmable, buffered analog outputs. The main output on XLR is transformerless servo-balanced and the second output is transformerless balanced on a DB-25 multi-pin connector. This allows two separate inputs to be fed at optimal levels from an optimized microphone preamp
Includes a 700Hz test tone at two different levels which can be bussed to any selected preamp channel. The two levels are at 0dBfs (maximum output level) and -20dBfs. The test tone at 0dBfs allows easy set up for finding maximum peak input into following stages. The -20dBfs tone is useful for digital systems which use a -20dB reference tone for '0Vu'
LED indicators for the status of each function for each channel. A twelve-segment LED meter displays headroom. Two eight segment LEDs show input gain or maximum output level on either of the two analog outputs. All indicators and metering can be monitored at the remote location
Front panel headphone output. Any channel can be selected and the output level adjusted
In the Box
Aphex 1788A - 8 Channel Remote Controlled Microphone Preamplifier
  • AC Power Cable
  • Limited 2-Year Warranty
  • Table of Contents
    • 1Description

    Aphex 1788A specs

    Number of Channels 8
    Inputs 8 x XLR
    Output 8 x XLR Main Output
    1 x 25-pin D-Sub (Tascam pin-out) for Monitor Output
    Phantom Power 48 V
    Multi Function Limiter
    Gain Range 65 dB
    Maximum Output Level +27 dBu
    Frequency Response 10Hz to 38kHz, +/-0.5dB
    Noise Hum and Noise: -125 dBu EIN
    Dimensions (WxDxH) 19.0 x 13.6 x 3.5" (48.3 x 34.5 x 8.9 cm)
    Weight 17 lb (7.7 kg)
    Specialties MIDI command protocol for full remote control, metering, and status
    Packaging Inforeyxduzxvvzbqxfbxetxvwedrzyudcesdddr
    Package Weight 22.15 lb
    Box Dimensions (LxWxH) 24.9 x 17.25 x 9.5"

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