DIGI-SYS PRO AUDIO DA 400 is a Professional audio distribution amplifier, designed to economically distribute the audio signals in a broadcast station or a recording studio. The PRO AUDIO DA 400 can effectively feed to various destinations the same source with transparent quality. The active output configuration allows the inputs and outputs patched freely through patching panel and drive long lines without interference. 

 DIGI-SYS PRO AUDIO DA 400 has excellent frequency response and very low distortion, which has been achieved by selectively using integrated circuits and discrete devices. Extremely low noise levels are achieved by eliminating hum at all stages and using low noise devices. There is an individual gain control to give ±5dB level adjustment. The unit is housed in a 19” rack mount chassis with power connections as per IEC recommendation.

  • Individual Adjustable Gain ±5 dB
  • Short Circuit Protected
  • Excellent Isolation
  • Ultra Low Noise
  • Flat Frequency Response
  • Extremely Low Distortion
  • Universal Power Supply
  • Wide Dynamic Range
  • Easy and Simple Maintenance



Input level

 0dBu +20dBu Max.

Input impedance

 10kW balanced



Output level

 0dBu nominal into 600W  

 +20dBu Max.

Output impedance

 50W (600W load) balanced

Gain control

 ±5dB (Other gain settings on request)

Frequency response

 <±0.5dB (30Hz to 16kHz)

Harmonic distortion 


Signal to Noise ratio

 >95 dB (Unweighted 22Hz-22KHz.)

Phase Difference


No. Of outputs

 Four stereo (Optional upto 6)

Protected against

 Short circuits and overload      

Inter output loading

                   a) 1 output shorting

                   b) 3 outputs shorting


 <0.1dB on remaining outputs   

 <0.3dB on remaining outputs

Inter-channel matching

  0.5 dB

Inter-channel cross talk

  70dB @ 16KHz.


  115/230V  (± 10%), 50/60Hz (± 4%) 20VA Max,


  Standard 19” rack mounting

Operating temperature

Relative humidity

  0ºC to 50ºC, non condensing

  10 to 90% RH non condensing




  44.5mmx483mmx203mm (1.75”x19”x8”)


  3 Pin XLR