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Balanced Analog Audio Distribution Amplifier

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The 7700ADA-AUD Dual Analog Audio Distribution Amplifier is a general purpose amplifier for distributing analog audio signals. It can be operated as two independent 4-output amplifiers for stereo signals, or as a single amplifier with eight outputs where higher fanout is required.

The 7700ADA-AUD can be operated with either differential or single ended inputs and offers a wide range of gain adjustment to handle a wide variety of input signals.


  • Differential and single ended input (automatic single ended to differential conversion)
  • Configurable for stereo (2-1x4) or mono (1x8)
  • High impedance input
  • Low impedance outputs
  • Wide gain adjustment range
  • High common mode range and common mode rejection ratio (CMRR)
  • Very high SNR
  • Very low THD+N
  • Card Edge LEDs

  • Module status/Local fault


Analog Audio Input

Standards Any analog audio signal
Number of Inputs 2 (Balanced or Single ended)
Connectors 3-pin removable terminal strips
Input Step Gain 0dB or +6.5dB (configurable with jumpers)
Fine Gain Control -6.5dB to +9.5dB (card edge pot adjustable)
Max Input Level
0dB Input Gain +34dBu
+6.5dB Input Gain +28dBu
Noise Floor -87dBu (0dB input gain), -91dBu (+6.5dB input gain jumper setup)
Common Mode Rejection > 115dB @ 60Hz, 90dB @ 20kHz (tested with +28dBu CM input)
Common Mode Range
0dB Input Gain > ±22V
+6.5dB Input Gain > ±7V
Input impedance 0dB gain 33kΩ
+6.5dB gain 18kΩ

Analog Audio Outputs

Number of Outputs
Stereo Mode 4 outputs each on left and right channels
Mono Mode 8 outputs
Connectors 3-pin removable terminal strips
Output Step Gain 0, 3.5 or 9.5dB (configurable with jumpers)
Max Output Level +28dBu across hi-impedance load
+24dBm into 600Ω load
Output Impedance 66Ω
Frequency Response ±0.02dB 20Hz to 20kHz
Stereo Phase Mismatch < 1°@ 20kHz
0dB Input Gain 115dB
+6.5dB Input Gain 119dB
THD+ Noise 0.001% 20Hz to 20kHz @ 28dBu, unweighted RMS, Hi-Z load
0.01% with 600Ω up to 24dBm
Intermodulation Distortion 0.001% - SMPTE @ 18dBu
Stereo Crosstalk > 115dB @ 1kHz, > 93dB @ 20kHz
Output Isolation > 110dB @ 1kHz, 100dB @ 20kHz


Voltage +12V DC
Power 12 watts
EMI/RFI Complies with FCC Part 15, Class A, EU EMC Directive


Number of Slots 1

Ordering Information

7700ADA-AUD Balanced Analog Audio Distribution Amplifier (Configurable 1x8 or 2-1x4)

Ordering Options

Notes Rear plate must be specified at time of order - eg: [model]+3RU
Rear Plate Suffix
+SA Standalone Enclosure Rear Plate
+3RU 3RU rear plate for use with 350FR, 7700FR-C, 7800FR or 7801FR Multiframes


350FR Portable Multiframe which holds 7 single slot modules
7700FR-C 3RU Multiframe which holds 15 single slot modules
7800FR 3RU Multiframe which holds 15 single slot modules
7801FR 1RU Multiframe which holds up to 4 single slot or 2 dual slot modules
S7701FR 7700 Series Standalone Enclosure