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Aphex 320D Compellor delivers transparent audio level control for broadcast, recording, and live sound. AES digital input and output.

The patented technologies within the 320D are totally unique. By going beyond conventional design ideas, the 320D provides audio processing with unprecedented sound transparency, yet is exceedingly effective at controlling levels. No other product can match the performance of the 320D. Algorithms like our "DVG", "DRC", and "FDL" have yet to find any rivals.

The 320D'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 is 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 320D'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 320D'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 320D can act as two independent mono processors or one linked stereo processor by front panel selection. 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
  • Specifications

  • Connector 3 pin XLR Female
  • Type Transformerless servo balanced RFI filtered
  • Impedance 22k ohms balanced, 11k ohms unbalanced
  • Operating Level user selectable +4dBu or -10dBv
  • Max input level +27dBu (ref = +8); +25dBu (ref = +4) +10dBV (ref = -10)
  • CMRR >90dB at 100Hz >70dB at 1kHz >50dB at 20kHz

  • Connector 3 pin XLR female
  • Type Transformer balanced
  • Impedance 110 ohms

  • Connector 3 pin XLR Male
  • Type electronic servo balanced (unbalanced without 6dB loss)
  • Impedance 65 ohms bal or unbal (nominal load 600 ohms or greater)
  • Max level out (bal) +25dBu (ref = +4) +10.8dBV (ref = -10)
  • Max level out (unbal) +20dBu (ref = +4) +10.8dBV (ref = -10)

  • Connector 3 pin XLR Male
  • Type Transformer balanced
  • Impedance 110 ohms

  • Frequency Response ±1dB 10Hz to 65kHz
  • Hum and noise (1k tone at unity gain)
  • No gain reduction -67 dBu (ref = +4) -86dBV (ref = -10)
  • 10dB gain reduction -74 dBu (ref = +4) -89dBV (ref = -10)
  • Crosstalk at 20kHz -65 dBu (ref = +4) -78dBV (ref = -10)
  • Dynamic THD typically .05% for 1kHz at 20dB gain reduction
  • Static THD .025% at maximum output level
  • IMD, max output .13% (ref = +4) .4% (ref = -10)

  • Compression
  • Frequency Discriminate Leveling
  • Peak Limiter
  • Dynamic Verification Gate (DVG)
  • Dynamic Recovery Computer (DRC)
  • Silence Gate
  • Stereo Enhance

  • Compressor 30dB below nominal level
  • Leveler 30dB below nominal level
  • Limiter 14dB above nominal level

  • Compressor 1.1:1 to 3:1 program dependent
  • Leveler 20:1
  • Limiter >30:1

  • Compressor 5 to 50msec program dependent
  • Leveler fast 20Hz = 1.5 Sec >1kHz Frequency Discriminate Leveler
  • Leveler slow 20Hz = 5 Sec >1kHz Frequency Discriminate Leveler
  • Limiter 1 uSec

  • Compressor 200mSec to 1 Second program dependent
  • Leveler fast 3 sec
  • Leveler slow 10 sec
  • Limiter 200 msec

  • Input SR Locks to 32, 44.1,48, 88.2, 96kHz ±3%
  • I/O Type AES/EBU 110 ohms XLR
  • Default Output SR User definable by replacing crystal; 48kHz standard
  • Word Clock Not Supported

  • Power Requirements 100 - 120 - 220 - 240 VAC, 50-60Hz 20 Watts
  • Dimensions 1.75"H x 19"W x 10.125" D (44.5mm x 482.6mm x 257mm) (allow for wire dress)
  • Net Weight 8 lbs (3.6 kg)
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