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Using the same classic design as found on the original SL4000 series
console, the main bus compressor can be used as a single stereo unit or
as a master 5.1 compressor. The compressor is assigned either to one of
the Mix A, B, C busses or the 5.1 mix bus via the main bus select matrix
(see previous page).
The ‘soft’ knee point of the compressor, ie. the level at which compression
start to take place, is set by the THRESHOLD control (± 20dB). This
is intentionally designed to change depending on the setting of the
RATIO control; decreasing the RATIO setting lowers the effective
threshold, hence maintaining the perceived ‘loudness’ of the compressed
signal. The RATIO switch has six settings, 1.5:1, 2:1, 3:1, 4:1, 5:1 and 10:1.
ATTACK time is switchable in six steps between 0.1 and 30 ms, and
the RELEASE time is selectable between 0.1 and 1.2 seconds in five
steps. The AUTO release selection adjusts the release time according
to the signal envelope.
The gain MAKE-UP simply acts as a level control to compensate for the
lowered level that is a consequence of compressing the signal. This control
may be set so as not to change the overall output level when the
compressor is switched in. The meter indicates dBs of gain reduction.
In 5.1 mode, two buttons, SRND TO S/C and LFE TO S/C
determine whether the surround and LFE channels contribute to the side chain, or not. A further button, S/C ∑,
defeats the normal 'loudest-bus-in-the-mix' side chain operation and substitutes a summing mode so that the gain
reduction is proportional to the soundfield energy as opposed to the loudest individual signal.
22--2211
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