QSC Audio CX168 Manuale Utente

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SETUP: 
SETTING THE MODE: STEREO, PARALLEL, OR BRIDGE
Modes
Stereo- Stereo mode supports two completely
separate audio channels, usually referred to as ‘left’
and ‘right’. Stereo configurations have two separate
input signals and two separate output signals.
Parallel- Parallel mode applies one input signal to
both channels.  Both inputs of a channel pair are
connected in parallel when the mode switch is set
for parallel, therefore, connect only one input per
channel pair when in parallel mode. The outputs are
connected the same as stereo mode. Each speaker
will be supplied the same signal, which is still
controlled by that channel’s gain control.
The following descriptions apply to a channel pair (such as Ch. 1 & 2 or Ch. 7 & 8). It is possible to set each channel pair’s mode
differently and customize the system configuration. All possible combinations will not be shown. The following describes the
behavior of one channel pair in the three modes of operation and the 
BRDG and PAR  LED’s:
Bridge- Bridge mode combines the two channels of
a pair (such as Ch. 3 & Ch. 4) into one higher-
powered channel. Like parallel mode, both inputs of
a channel pair are connected in parallel when the
mode switch is set for parallel, therefore, connect
only one input per channel pair when in bridge
mode. There are 4 possible channel pairs that can
be bridged on the CX168. They are Ch.1-2 Bridge,
Ch. 3-4 Bridge, Ch. 5-6 Bridge, and Ch. 7-8 Bridge.
Any pair or number of pairs can be independently
configured in bridge mode. Use the first channel’s
input and gain control when in bridge mode. The
second channel’s gain control is non-operative and
should be turned all the way down.
For pictorial description of operating modes, see Appendix.
Mode switch settings and LED indication for parallel mode operation.
BRDG indicator and PAR indicator should be illuminated when in bridge
mode.
Mode switch settings and LED indication for stereo mode operation.
BRDG and PAR indicators should not be illuminated when in stereo mode.
Mode switch settings and LED indication for parallel mode operation.
PAR indicator should be illuminated and BRDG indicator should not be
illuminated when in parallel mode.
Note! Do not connect more than one input per channel pair when operating in parallel or bridge mode. However,
in parallel or bridge mode, the unused input terminals may be used for daisy-chaining the input signal to other
channels of the CX168 or to other amplifiers.