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Find great deals for Aphex USA Compellor A Compressor Leveler Limiter Rackmount. Shop with confidence on eBay!. The A delivers “intelligent” compressor action, leveling and peak limiting simultaneously. It can be used to solve audio level problems and improve audio. Great comressor/limiter unit, works well in the studio and live. APHEX COMPELLOR A RACK COMPRESSOR LIMITER LEVELER BROADCAST AUDIOFully.

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Aphex Compellor 320a Dual Compressor Limiter Expander

So it’s ideally suited to broadcast work. There is no rolloff of the lows, and the highs only roll off a bit at the highest compression settings. When the digital input is used, the analog output contains the D’s processing, properly leveled. It combines compression, limiting, leveling, and gating, and those functions are all controlled in an interconnected way by an automatic “program adaptive” system. Enter new zip code to refresh estimated delivery time. I also noted that compeplor limiter was not so useful, it only kicked in on the most extreme peaks.

Aphex A COMPELLOR – Dual Channel Compressor/Limiter A B&H

See any errors on this page? The tone is completely transparent. It works differently at different frequencies and 320s processing when the sound stops, then resumes instantly when the sound reappears, so there’s no distracting increases in copmellor background noise.

On the other hand if your technique and signal are already fairly even, and you just want to enhance the punch and harmonics, and set your place in the mix, this is a good tool for that purpose.

It doesn’t generate any noise of its own, although like all compressors it can amplify existing noise at higher settings. The D’s limiter acts on peaks that shoot beyond average program levels so they are easy to handle by any analog or digital recording system.


Patented control circuits include analog computers that continuously analyze the input signal, and vary the control characteristics to provide for virtually undetectable operation, regardless of the dynamics of the program. Some Compellors have literally been in hour use in the same rack for a decade or longer! The Silence Gate immediately releases when the program material resumes. The A is then ready to provide complete dynamic control – smooth, inaudible compression, increased system gain, desired program density and the freedom from constant “gain riding” – all performed automatically.

Reviews 0 Write a review. This is a two-channel rackmount unit, and it’s quite different from the other comps I’ve reviewed.

In mono mode, unit provides two completely independent channels of processing. The patented technologies within the D are totally unique.

You might say a steady, level signal doesn’t need any compression, but the processed signal is much more “present” and “energetic” sounding than the dry signal.

The D’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.

The A provides the option of Dual Mono or Stereo operation. So overall my impression is that this comp is a fantastic tool, which really does offer some valuable processing power and a super clean sound; but it is not well suited for use in any rig where the dynamics and signal peaks can vary wildly.

By going beyond conventional design ideas, the D provides audio processing with unprecedented sound transparency, yet is exceedingly effective at controlling levels. I think the A version is discontinued, only available used.


Copying is prohibited, but please feel free to link to this page using the link text “compressor reviews”. With some careful experimentation I was eventually able to find a setting that worked decently for the hard-to-control bass with a minimum of artifacts, but it took some time.

Aphex USA Compellor 320A Compressor Leveler Limiter Rackmount

Extensive compressor reviews and FAQ. It will try very hard to normalize an unruly signal, resulting in the noise level raising and dropping constantly.

With the active, the automatic levelling functions were trying so hard to regulate the signal that the noise level would jump up and down, and playing that B string hard caused a lot of distortion. The front panel metering system displays input level, output level or gain reduction levels. In Stereo mode, the user can choose between linking only the leveling control signals or linking both the compression and leveling signals.

With the passive, this comp really brought out the sound in a punchy, articulate way, with nice clear harmonics, and no noticeable noise or artifacts.

When you specify a Compellor, you know it will do its job flawlessly and give you peace of mind. Whereas with the more even-output bass, with steadier playing, sphex was fairly easy to find a clean, natural-sounding, noiseless setting. Its unique circuit design actually enhances transient qualities, thus making even heavy processing undetectable.

Overview Tech Specs Gallery Downloads.

All potentiometers are detented for accurate resetting of controls. The A delivers “intelligent” compressor action, leveling and peak limiting simultaneously.