The Aphex 320A Compellor is a dual-channel automated compressor / leveller / limiter capable of delivering "intelligent" compressor action, levelling and peak limiting simultaneously.

The Aphex 320A 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. 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.

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 320A 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. Its unique circuit design actually enhances transient qualities, thus making even heavy processing undetectable.

The 320A provides the option of Dual Mono or Stereo operation. In mono mode, unit provides two completely independent channels of processing. In Stereo mode, the user can choose between linking only the leveling control signals or linking both the compression and leveling signals. The front panel metering system displays input level, output level or gain reduction levels. All potentiometers are detented for accurate resetting of controls. A Leveling Speed (fast/slow) switch is located on the front panel, as is the defeat switch for the peak limiter. Operating reference levels are selectable from -10dBV, +4dBu or +8dBu.

Function Compressor/Leveler/Limiter
Number of Channels 2
Inputs 2 x XLR
Output 2 x XLR
Maximum Input Level +25dBu when set for +4dBu operation
Compression Threshold Compressor: 30dB below nominal level
Leveler: 30dB below nominal level
Limiter: 12dB below nominal level
Compression Ratio Compressor: 1.1:1 to 3:1 program dependent
Leveler: 20:1
Limiter: >30:1
Attack Time Compressor: 5 to 50mSec program dependent
Leveler: Frequency dependent
Limiter: 1,uSec
Release Time Compressor: 200mSec to 1 sec program dependent
Leveler: 3 sec (fast), 10 sec (slow)
Limiter: 20mSec
Gate Threshold Not applicable
Gate Rate Not applicable
Maximum Output Level +20dBu when set for +4dBu operation
Make-up Gain Not specified by manufacturer
Frequency Response 10Hz to 65kHz
Dynamic Range Not specified by manufacturer
Noise Not specified by manufacturer
Dimensions 1U rack mount
Specialties RJ-11 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. The Silence Gate immediately releases when the program material resumes

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