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

Download Datasheet


Analog Audio Input
StandardsAny analog audio signal
Number of Inputs1 (Balanced of Single ended)
Connector3 pin removable terminal strip
Input step gain0dB 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 gain44kΩ
+6db input gain26kΩ
Analog Audio Output
Number of Outputs9
Connector3 pin removable terminal strips
Output step gain0, 3.5 or 9.5dB (configurable with jumpers)
Max. output level+28dBu across hi-impedance load
+24dBu into 600Ω load
Output Impedance66Ω
Freq. Response±0.03dB 20Hz to 20kHz
THD+N0.001% 20Hz to 20kHz @ 28dBu, unweighted RMS
Output Isolation> 100dB @ 1kHz, 100dB @ 20kHz
Voltage+12V DC
Power3.6 Watts
EMI/RFIComplies with FCC Part 15, Class A
EU EMC Directive
Number of Slots1

Ordering Information

400ADA-AUDAnalog Audio Distribution Amplifier (1x9)
400FR3RU exponent Compact High Density Balanced Audio Distribution Frame
400FC400FR VistaLINK® Frame Controller