Output Control, Process Switch, Input/Output

7.14 Output Control

This control allows you to normalize the output level to 0VU after the processing is set up. It will usually get set around 12 o’clock, but there is a plus or minus 10dB range available which is useful if you need to match a slightly odd level.

7.15 Process Switch

This operates a bypass relay which completely bypasses the Compellor in the process out mode. The relay will also go to bypass if the power is shut off or the power supply fails. This is a life saver in cases where the program must never be lost such as broadcast chains or live performances.

7.16 Input/Output

The Compellors use the Aphex active servo balanced input and output stages. We like to specify pin 2 as positive but this is purely arbitrary since the balanced input and output pins are directly in phase and there is no dedicated unbalanced output which would be specified in relation to the input phase. You could just as well call pin 3 positive if that is what you want.

7.17 Operating Levels

A rear panel rotary switch for each channel selects the normal operating level for the Compellor. You can chose -10dBV, +4dBu, and +8dBu as the reference level. This switch sets the dynamic range of the Compellor’s circuitry to best match your standard operating level, and also sets the 0dB calibration of the front panel audio level meter to equal the refer- ence level selected.

7.18 Input/Output Metering

When the Meter Select button is toggled into either Input or Output, the bi-color LED meter is programmed to indicate a bar graph from left to right. Within the bar graph is a red portion and a green portion. The red portion indicates the VU or “average” level and the green por- tion indicated the peak level of the signals. Figure 9-1 shows an example of an audio level indication showing a zero VU signal with a peak level of +9dB.

This would translate to an average signal level of +4dBu with a peak value of +13dBu if the Compellor were normalized to +4dBu. Note that, since the peak value is always greater than the average value of an audio signal, the green bar always appears to the right of the red bar.

-15	-12	-9	-6	-3	0	3	6	9	12	PGM (dB)
2	4	6	8	10	12	14	16	18	20	G.R. (dB)

6 Reds

3 Greens

Figure 7-1 Bargraph Level Meter Example

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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.