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Program Descriptions
MPX 550
4-33
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.
. . . continued on page 4-34