Aphex 320D Compellor

2-channel Compressor/Limiter with Analog and Digital I/O
Aphex 320D Compellor image 1
Aphex 320D Compellor image 1
Sweetwater Savings: $350.00 MSRP: $1,699.00
Special Order
Special-ordered from Aphex and usually arrives to you within 1-2 weeks. Please note: special orders cannot be canceled or returned.
Note: While most of the items we sell ship for free, this item does not qualify for free shipping due to special circumstances.

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Aphex 320D Compellor
Special Order

Maximize your audio with the Compellor!

The 320D Compellor audio level controller from Aphex fits into any broadcast, studio, or live sound rig and serves as a great way to compress and limit program material. This 1U rackmountable unit delivers intelligent compressor action, leveling, and peak limiting simultaneously to solve audio level problems and improve audio signals. The 320D Compellor converts between acting as two independent mono processors and one linked stereo processor by front panel selection. This is true with both analog and digital I/O. Get the most out of your audio with the 320D Compellor!

Aphex 320D Compellor at a Glance:
  • A/D or D/A
  • Proprietary Aphex Technology
  • Legacy
A/D or D/A

The 320D serves as a fine A to D converter with processing. When you use the analog input, the digital output contains the Compellor's processing and is ready for use in almost any application. Conversely, the 320D serves as a fine D to A converter. When you use the digital input, the analog output contains the Compellor's processing and is properly leveled and packaged. The professional analog audio inputs and outputs are fully balanced and adapt to consumer or professional operating levels at the touch of a button. Analog or digital source selection is made at the rear panel.

Proprietary Aphex Technology

The Compellor circuits are totally unique. By throwing away all conventional design ideas, we created audio processing with unprecedented sound transparency yet is exceedingly effective at controlling levels. Because our designs are patented, no other company has been able to match the performance. Algorithms such as our DVG, DRC, and FDL have yet to find any rivals. Aphex engineering and manufacturing produce products that last and last without needing 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.


The first Compellor was introduced in 1983 as an analog product. Because of their advanced technology, most of those older units are still in regular use. Since that time, newer models have been produced, still in analog form. Digital technology of today promises many improvements in user interfaces, and sometimes in sound quality, but not in audio processing algorithms. No digital processor can match an analog Compellor for sound quality and effectiveness. Nevertheless, many of today's systems need a Compellor that can interface to digital audio. With the Model 320D, Aphex brings you just that. You get all the advantages of the analog processor with AES3 connectivity.

Aphex 320D Compellor Features:
  • Frequency Discriminate Leveler: No bass pull-back in music
  • Dynamic Release Computer
  • Dynamic Verification Gate: Adds greater transparency
  • Silence Gate: Locks gain when audio stops
  • Process Balance: Lets you have any combination of leveling and compression
  • True Bypass: No electronics in bypass
  • AES3 I/O up to 96kHz
  • Analog I/O: Fully balanced professional
  • High Reliability: Famous Aphex Engineering
  • Stereo & Dual Mono: Use as 2 separate channels or linked for stereo
  • Source Select: Choose digital or analog input
  • Dual Outputs: Use both digital and analog at the same time with either input selected
  • Controller with Digital and Analog I/O
  • Analog Inputs/Outputs: 3-pin XLR Female
  • Digital Inputs/Outputs: 3-pin XLR Female
  • Frequency Response: +/-1dB 10Hz to 65kHz
  • Ratio: Compressor 1.1:1 to 3:1 program dependent; Leveler 20:1; Limiter >30:1
Great level control with Aphex's 320D Compellor!

What Does "Special Order" Mean?

A special-order product is one that we don't normally keep in stock. We order it from the manufacturer as soon as you order from us. We have great relationships with all the manufacturers we carry, so we can get your special order to you as fast as or faster than anyone else. Remember that special orders are non-returnable and non-cancelable, so make sure the item is right for you. A Sweetwater Sales Engineer can help you decide — call (800) 222-4700 for assistance!

Additional Media

320D Compellor User Manual
Signal Processing Buying Guide

Tech Specs

Type VCA
Number of Channels 2
Controls Drive, Process Balance, Output, Threshold
Threshold -40 dB to 0 dB
Ratio 1.1:1 to 3:1
Frequency Response 10Hz-65kHz
Inputs 2 x XLR, 1 x AES/EBU (XLR)
Outputs 2 x XLR, 1 x AES/EBU (XLR)
Rack Spaces 1U
Height 1.75"
Depth 10.13"
Width 19"
Weight 8 lbs.
Manufacturer Part Number 320D

Customer Reviews

Based on 1 review
Write your review

Aphex Compellor Install at Christian Broadcast Station

We love our Aphex 320D! We used the Compellor to send our audio from the studio to the transmitter where our Optimod was located. We located the Compellor just ahead of our microwave transmitter STL. We fed two stations through the Compellor, one for each channel. Our signal stands out on the AM band now and sounds better than ever! The audio is punchy, steady and very 'listenable'. It's a perfect companion to the Optimod .
Music background: Chief Broadcast Engineer

Sweetwater Advice

Derek Senestraro

Added this at my church and it's fantastic. We were having trouble with inconsistent levels at TVs and the video feed for recording - but not any more! The Aphex 320D Compellor is a super consistent and solid compressor/limiter. Now our music sounds punchy and tight, and the preacher sounds clean and present. Overall, the Compellor is a great unit that works exactly as needed.
See also: Compressors, Aphex, Aphex Compressors / Limiters, Aphex Compressors / Limiters