96 Chapter 11: Panning
PRO1 Live Audio System
Operator Manual
SIS™ (LCR) mode
The MIDAS SIS™, which is used for left-centre-right (LCR) loudspeaker systems,
configures the channel for LCR mixing. The SIS switch activates the spatial imaging
system, which uses the SIS image control knob to modify pan control knob operation
so as to place the channel within a three-speaker system.
With SIS image control knob set fully clockwise or anti-clockwise, image is full LCR or
stereo, respectively. Control knob positions in between generate a composite blend of
stereo or LCR panning systems, so that optimum degrees of centre image focus and
speaker power can be obtained.
Constant power is maintained at all times so that the image can be adjusted during the
show without a perceived change in level.
SIS image control knob fully clockwise (LCR)
With the SIS image control knob fully
clockwise, the pan control knob operates
in full LCR mode. A centre-panned signal,
that is, with the pan control knob set to
the c position, routes to the centre
speaker only; there is no signal in the left
and right speakers.
SIS image control knob fully anti-clockwise (stereo)
With the SIS image control knob fully
anti-clockwise, the pan control knob
operates as stereo. A centre-panned
signal routes to the left and right speakers
at equal power.
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