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Operation Manual
I-Tech HD Series Power Amplifi ers
page 30
4.8.7 Input Signal Compressor
An input signal compressor is available for each channel. Several parameters control this
feature:
On/off button: Enables or disables this function.
Threshold: Sets the level, in dBu, above which the compressor begins to attenuate the input
signal. This level corresponds to the input level meter reading. The compressor is “feed-
forward,” meaning that the level detection point is located before the gain control stage. The
range is from +20 dBu to – 50 dBu.
Attack Time: Sets the attack time of the compressor. The attack time is defi ned as the time it
takes the compressor to attenuate the signal gain by 20 dB. The range is from 1 millisecond to
0.1 second.
Release Time: Sets the release time of the compressor. The release time is defi ned as the
time it takes the compressor to increase the sig nal gain by 20 dB. The range is from 10
milliseconds to 10 seconds.
Compression Ratio: Sets the compression ratio of the compressor. The ratio is the relation
between the amount of attenuation applied by the compressor verses the amount that the input
signal is over the threshold. The available settings are 2:1 to 32:1.
Makeup gain: The amount of gain you want to apply to the compressed signal to raise it to a
higher level.
Knee width: The knee of the compression curve is the transition point between no
compression and compression. The wider the knee, the more gradual is the transition -- so
compression is not so obvious when the signal is close to threshold.
Beyond the controls for each channel, a single-control Com pressor Tie connects the
compressors together. The compressors are tied at their sense points, meaning that the greater
of the two input signals will be used as stimulus for both compressors. Each compres sor will
still compress based on its individual threshold, attack, release and ratio settings.
4.8.8 Input Delay and Driver
Delay
In these screens you can set the signal
delay for each channel in seconds, feet or
meters.
4 Advanced Operation