Classic Recording Studio Equipment

Vintage Digital

Aphex 320D Compellor

Aphex 320D Compellor

By going beyond conventional design ideas, the Aphex 320D Compellor provides audio processing with unprecedented sound transparency, yet is exceedingly effective at controlling levels.


No other product can match the performance of the Aphex 320D Compellor. Algorithms like our “FDL”, “DVG” and “DRC” have yet to find any rivals.

The Aphex 320D Compellor’s Frequency Discriminate Leveler section, with the Dynamic Verification Gate and the Silence Gate, slowly adjusts the volume level of an audio stream with very complex algorithms that hide its work. It works differently at different frequencies and stops processing when the sound stops, then resumes instantly when the sound reappears, so there’s no distracting increases in program background noise. When you listen, you know the levels are made more even, but you don’t perceive the levels are shifting.

The Aphex 320D Compellor’s Variable Slope Compressor, Dynamic Recovery Computer and Dynamic Verification Gate add adaptable compression to match the texture of changing audio sources. You don’t hear pumping or other audio artifacts, just natural sound that is evenly consistent in loudness.

The Aphex 320D Compellor’s limiter acts on peaks that shoot beyond average program levels so they are easy to handle by any analog or digital recording system.

The Aphex 320D Compellor can act as two independent mono processors or one linked stereo processor, which is selectable on the front panel. This is true with both analog and digital I/O.

When the analog input is used, the digital output contains the 320D’s processing. When the digital input is used, the analog output contains the 320D’s processing, properly leveled.

Aphex builds products that last and last without need for repairs or calibration. Some Compellors have literally been in 24-hour use in the same rack for a decade or longer! When you specify a Compellor, you know it will do its job flawlessly and give you peace of mind.


  • Broadcast pre-processing
  • MP3 encoding and playback
  • Recording
  • Installed and mobile sound
  • DAW input
  • Mastering
  • Satellite uplinks
  • Background music
  • Ham radio
  • Tape duplication
  • Cable TV



  • Frequency Response: 10Hz – 38 kHz(± 0.5dB)
  • Dynamic Range: 120 dB
  • Hum and Noise: (unweighted 22Hz-22kHz) -93 dBu
  • Crosstalk: (10 Hz – 22kHz) -79 dB
  • THD: (10 Hz – 22kHz at max. output) .0003%
  • IMD: (10 Hz – 22kHz at max. output) .0007%
  • Power requirements: 90-250 VAC 50-60 Hz 12W
  • Dimensions: 482.6mm x 44.5mm x 209.6mm
  • Weight: 2.73 kg


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Aphex 320D Compellor

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Audio Wizardry in a Box, the APHEX 320D Compellor Delivers!

by Greg Page

Sound Quality 90%
Build Quality 80%
Usefullness 100%
Mojo/Funk 80%
Reliability 80%

The APHEX 320D Compellor is an absolute game-changer. It’s pure magic! Whether you’re a pro or just getting started, this little beauty will make your audio sound top-notch. It’s a real must-have for any studio setup. Cheers!

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