320A

7. System Description

Compellor

ground noise, but below the lowest program signal expected. Typically, a setting of -30dB (at about 9 o’clock) is satisfactory for all purposes.

If, for some reason, you want to prevent the Compellor from bringing up program fades below a certain point, simply set the Silence Gate threshold to the level where you want the fade to become “uncorrected”. The Compellor will then freeze its automatic gain control and let the program continue fading out naturally.

7.8 Stereo Enhance

When the Stereo Enhance button is selected, the sidechain signals are coupled in a man- ner which helps to push the stereo image slightly wider depending on the amount of com- pression. This is purely a function of the interactive gain reduction of the two channels, and does not matrix or modify the main audio paths. The effect is valid even when the leveling is stereo linked. If the compression is stereo linked then the effects of “Stereo Enhance” are eliminated.

7.9 Stereo Linking

Two link modes are possible with the model 320A. The first mode links only the leveling systems of the two channels. The second mode links both leveling and compression. You cannot link compression only.

7.10 Meter Selections

The Compellor’s dual color LED meters have a three position meter selector which is oper- ated as a scanning push switch. Three LED’s indicate the meter mode as the selector is repeatedly depressed to cycle through the selections. Selection 1 displays the Compellor’s incoming signal level. Selection 2 shows the Compellor’s output level. Selection 3 shows the Compellor’s VCA gain reduction level.

The audio level selections set up the meter in two colors to simultaneously indicate the aver- age, or “VU meter” level, and the peak level. VU is shown in red and peak in green. In the gain reduction setting, the meter uses two colors to simultaneously indicate the leveling and compression gain control.

7.11 Limiter

The peak limiter has a very fast attack of less than 1 microsecond. This positively stops audio peaks from escaping the VCA if the limiter is turned on. The threshold of limiting is about 14dB above the output zero VU reference level. With such a high threshold, the limiter only activates occasionally when excessively high transients are present in the output audio.

7.12 Process Balance

This control allows you to balance the relative amount of leveling and compression being used. Normally, this control is used with the Drive control to obtain the exact proportions and depth of gain reduction desired. Process Balance should be set more towards Level (CCW) for a more dynamic sound and more towards Compress (CW) for tighter instantaneous dynamics.

7.13 Drive Control

This control sets the VCA gain ahead of the processing threshold and thus sets the depth of processing for a given input signal. The higher the drive, the more gain reduction.

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Aphex Systems 320A owner manual Stereo Enhance, Stereo Linking, Meter Selections, Limiter, Process Balance, Drive Control
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320A specifications

The Aphex Systems 320A is a dynamic processor designed to enhance the quality of audio recordings in professional settings. Known for its exceptional performance and versatility, the 320A offers a unique combination of compression, limiting, and expansion functionalities. This unit is an essential tool for sound engineers and producers looking to achieve polished sound.

One of the standout features of the 320A is its dual channel processing capability. This allows users to apply dynamic processing to two separate audio signals simultaneously, making it ideal for stereo or dual mono setups. The 320A offers a range of controls, including threshold, ratio, attack, release, and gain, allowing precise adjustments to be made according to the needs of any project.

The 320A utilizes Aphex's proprietary Intelligent Clipping technology, which helps to prevent distortion at high signal levels. This feature is particularly beneficial when working with dynamic sources like vocals and percussive instruments. Intelligent Clipping ensures that the audio remains smooth and clear, even when processed aggressively.

In terms of connectivity, the Aphex 320A is equipped with balanced XLR and TRS inputs and outputs, ensuring compatibility with various audio sources and devices. The unit supports both line-level and mic-level signals, providing flexibility for different recording scenarios. Additionally, its low noise operation ensures that the final output retains pristine audio quality.

Another significant characteristic of the 320A is its user-friendly interface. The front panel features easy-to-read meters and clearly defined controls, making it straightforward for users to monitor the audio levels and adjust settings in real-time.

The 320A also includes a sidechain capability, allowing users to trigger compression or expansion from an external source. This feature is useful for achieving effects like ducking or creating rhythmic dynamics in a mix.

In summary, the Aphex Systems 320A is a feature-packed dynamic processor that serves as an invaluable tool for audio professionals. With its dual channel processing, Intelligent Clipping technology, flexible connectivity options, and user-friendly design, the 320A stands out in the realm of audio processing equipment, delivering high-quality performance for a variety of recording and mixing applications.
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