Lexicon MPX 550 manual Compression

MPX 550

Program Descriptions

Meters (GR, In)

Selects between gain reduction (GR) and input level (In) metering. (See page 4-35 for more information.)

COMPRESSION

Compression is used to lower the overall level of sound sources that rise above an adjustable compression threshold. Compression can be used to match the levels of louder sources to those of quieter sources.

Ratio (1:1 to 10:1)

Determines the level of gain reduction applied when the sound source rises above the compression threshold. It can be set in ratios of 1:1, 1.60:1, 2.00:1, 2.66:1, 3.20:1, 4.00:1, 5.33:1, 8.00:1 and 10:1. For each dB rise in input to the compressor, the ratio indicates the fraction of the dB rise in output. For example, when Ratio is set to 4.00:1, the output will rise 0.25dB for each dB rise in input to the compressor. Higher settings will result in more compression.

Thresh (-31 to -0dB)

Designates the compression threshold, the level the sound source must rise above before compression is applied.

Attack (200 to 3.0msec)

Determines how fast the compressor responds to sound sources that rise above the compression threshold. Slower settings allow the signal to rise above the threshold for short periods of time with minimal compression.

Release (4.0 to .30sec)

Determines how fast compression is reduced when sound sources fall below the compression threshold. Slower settings reduce compression gradually. Faster settings reduce compression more quickly, causing the level of the sound source to be tracked more closely.

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