Справочник Пользователя для Crown Audio IT9000 HD

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.