BBE MaxCom [13/24] Operation

9

A ratio of 1:1 indicates that the output signal will correspond to the input signal i.e., there is no level change. A

ratio of 2:1 indicates that for every 2 dB increase in input level above the threshold there will be a correspond-

ing increase in output level of 1dB. A ratio of 10:1 indicates that for every 10dB increase in input level above

the threshold there will be a corresponding increase in output level of 1dB, etc. If the RATIO control is set fully

clockwise, this corresponds to a ratio of innity:1. This means that all input levels are reduced to the threshold

point and are thus kept constant. It is worth observing that a hard or innite-ratio limit has applications in cer-

tain specialized situations, but in general this setting is neither appropriate nor necessary as this would cause

audible side effects.

A short attack time is required for transients such as handclaps and percussive instruments like snare drums so

that the compressor is in a position to regulate these types of peaks. With other kinds of program material it can

be advantageous to apply longer attack times. It is always recommended, however, to begin processing with

longer attack times. Whenever it is required, the time should be reduced carefully as the danger of dynamics

distortion usually increases with shorter attack times.

The attack time of the MAXCOM can be set within a range of 0.1 to 200 milliseconds.

• RELEASE CONTROL

Another feature of the MAXCOM is the release time. This determines the time that the compressor requires to

return to its unity gain after the input signal has fallen below the threshold point. The release time is largely de-

pendent on the program material. If the time is incorrectly set, this can lead to two fundamental problems:

• AUTO SWITCH

Attack and release times are important parameters which signicantly inuence the quality of the dynamic con-

trol process. When the AUTO switch is engaged, the manual ATTACK and RELEASE controls are put out of

action. The attack and release times are automatically derived from the program material by means of intelligent

program recognition so that setting errors can be effectively avoided. The AUTO function eliminates side effects

such as pumping and modulation distortion.

• OUTPUT CONTROL

Because compression and limiting are both gain reduction processes, the output of a compressor/limiter is often

at a lower level than the normal operating level. This loss of level must be compensated for. A reduction in the

output level is required if the operating level of subsequent equipment is lower (for instance, if the subsequent

to all of the MAXCOM circuitry, so that all the required controls can be used “Dry” that is without affecting the

original signal. This, in conjunction with the GAIN REDUCTION meter, provides a powerful tool for comparing

processed and unprocessed signals prior to operating the bypass switch and going “live”.

• GAIN REDUCTION METER

This meter provides a convenient visual indication of the amount of gain reduction that is taking place at any

time. If a signal exceeds the input level of the threshold point this function of the Compressor comes into play

and the GAIN REDUCTION meter shows the actual measurement of gain reduction.

OPERATION