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Analog Audio Distribution Amplifier

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The 400ADA-AUD Analog Audio Distribution Amplifier is a general-purpose 1x9 amplifier for distributing balanced analog audio signals.

The 400ADA-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.

The 400ADA-AUD is housed in the 3RU Exponent 400FR frame that will hold up to 16 modules.


  • Differential and single ended input (automatic single ended to differential conversion)
  • High impedance inputs
  • Low impedance inputs
  • Wide gain adjustment range
  • High common mode range and common mode rejection ratio
  • Very high SNR
  • Very low THD+N
  • Card Edge LEDs

  • Module status / Local fault
  • Power supply status


Analog Audio Input

Standards Any analog audio signal
Number of Inputs 1 (Balanced of Single ended)
Connector 3 pin removable terminal strip
Input step gain 0dB or +6dB (configurable with jumpers)
Fine gain control -5 to +5dB (card edge pot adjustable)
Maximum input level
0dB input gain +34dBu
+6db input gain +28dBu
Common Mode Rejection > 105dB @ 60Hz
Common Mode Range
0dB input gain > ±22V
+6db input gain > ±7V
Input impedance
0dB input gain 44kΩ
+6db input gain 26kΩ

Analog Audio Output

Number of Outputs 9
Connector 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
+24dBu into 600Ω load
Output Impedance 66Ω
Freq. Response ±0.03dB 20Hz to 20kHz
THD+N 0.001% 20Hz to 20kHz @ 28dBu, unweighted RMS
Output Isolation > 100dB @ 1kHz, 100dB @ 20kHz


Voltage +12V DC
Power 3.6 Watts
EMI/RFI Complies with FCC Part 15, Class A
EU EMC Directive


Number of Slots 1

Ordering Information

400ADA-AUD Analog Audio Distribution Amplifier (1x9)


400FR 3RU Exponent Compact High Density Balanced Audio Distribution Frame


400FC 400FR VistaLINK® Frame Controller