Duality SE Operator's Manual - Solid State Logic

Console OperationsMain Bus CompressorUsing the same classic design as found on the original SL 4000 Series console, themain bus compressor can be used as a single stereo unit or as a master 5.1compressor. The compressor is assigned either to one of the Mix A, B, C bussesor 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 startto take place, is set by the tHresHOlD control (±20dB). This is intentionallydesigned to change depending on the setting of the ratIO control; decreasingthe ratIO setting lowers the effective threshold, hence maintaining theperceived ‘loudness’ of the compressed signal. The ratIO switch has sixsettings, 1.5:1, 2:1, 3:1, 4:1, 5:1 and 10:1. attaCK time is switchable in six stepsbetween 0.1 and 30 ms, and the release time is selectable between 0.1 and1.2 seconds in five steps. The autO release selection adjusts the release timeaccording to the signal envelope.The gain MaKe-up simply acts as a level control to compensate for thelowered level that is a consequence of compressing the signal. This control maybe set so as not to change the overall output level when the compressor isswitched in. The meter indicates dBs of gain reduction.In 5.1 mode, two buttons, srnD tO s/C and lFe tO s/C determinewhether the surround and LFE channels contribute to the side chain, or not. Afurther button, s/C , defeats the normal ‘loudest-bus-in-the-mix’ side chainoperation and substitutes a summing mode so that the gain reduction isproportional to the soundfield energy as opposed to the loudest individual signal.Duality se V3 Operator’s Manual2-21