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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Its unique circuit design actually enhances transient qualities, thus making even heavy processing undetectable. The A is then ready to provide complete dynamic control – smooth, aphhex compression, increased system gain, desired program density and the freedom from constant “gain riding” – all performed automatically. I also noted that the limiter was not so useful, it only kicked in on the most extreme peaks.

Extensive compressor reviews and FAQ.

RJ connector on the rear panel facilitates remote relay bypass of the unit A Silence Gate feature detects significant gaps in the program material and freezes the processing, thus preventing noise “swell” or “build-up”, a condition commonly audible in other automatic gain control devices.

See any errors on this page? Enter new zip code to refresh estimated delivery time. It combines compression, limiting, leveling, and gating, and those functions are all controlled in an interconnected way by apehx automatic “program adaptive” system.

There is no rolloff of the lows, and the highs only roll off a bit at the highest compression settings. It can be used to solve audio level problems and improve audio signals in the broadcast or recording studio, tape duplication house, film-dubbing studio or in live sound applications. I used it with two basses: The tone is completely transparent.

Overview Tech Specs Gallery Downloads. Copying is prohibited, but please feel free to link to this page using the link text “compressor reviews”. So right at the outset, this unit is capable of far more advanced dynamics control than most other comps, but it can also be harder to use since the controls are unfamiliar and non-concrete. 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.


No other product can match the performance of the D. Aphex builds products that last and last without need for repairs or calibration. 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. Reviews 0 Write a review. 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 A COMPELLOR – Dual Channel Compressor/Limiter A B&H

The front panel metering system displays input level, output level or gain reduction levels. 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. Playing irregularly–a few notes, then a rest, then a few more notes–also caused the automatic sensors to work overtime, which resulted in audible artifacts.

Be the first to review this item. No Longer Available Update Location close. It will try very hard to normalize an unruly signal, resulting in the noise level raising and dropping constantly. 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. All potentiometers are detented for accurate resetting of controls.

Extremely easy to operate, the user only needs to set the Drive level to generate the desired amount of processing, set the Process Balance control between Leveling and Compression and adjust the Output level for unity gain. The stated purpose of this processor is to normalize match the output levels of low-level and high-level incoming signals. By going beyond conventional design ideas, the D provides audio processing with unprecedented sound transparency, yet is exceedingly effective at controlling levels.


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You don’t hear pumping or other audio artifacts, just natural sound that is evenly consistent in loudness. 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 compellod lot of distortion.

When the analog input is used, the digital output contains aphdx D’s processing. The D’s Frequency Discriminate Leveler section, with the Dynamic Verification Gate and the Silence Gate, slowly adjusts the volume 320z 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. In mono mode, unit provides two completely independent channels of processing.

The A provides the option of Dual Mono or Stereo operation. Some Compellors have literally been in hour use in the same rack for a decade or longer! The D can act as two independent mono processors or one a;hex stereo processor, which is selectable on the front panel.

Aphex USA Compellor A Compressor Leveler Limiter Rackmount | eBay

This is a two-channel rackmount unit, and it’s quite different from the other comps I’ve reviewed. When the digital input is used, the analog output contains the D’s processing, properly leveled. In Copellor mode, the user apnex choose between linking only the leveling control signals or linking both the compression and leveling signals. When you listen, you know the levels are made more even, but you don’t perceive the levels are shifting. 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.