QSC SRA 1222 User Manual page 17

SETUP-
Operating Mode Selection: Bridge
Bridge Mode
In bridge mode, both output
channels are interconnected into
one, higher power output. The
result is one output with about 4
times the peak power and about 3
times the sustained power of a
single channel.
Use CH1's gain control, clip limiter,
and LF filter. Use channel 1's XLR or
RCA input.
Output connection is different for
bridge mode; the positive output for
each channel gets connected to the
loudspeaker. Page 24 details bridge
mode output connections for
binding posts, and page 26 for
Speakon bridge output connections.
Bridge Mode Notes:
•To operate in bridge mode, set switches 4, 5, 6
to the left and switch 7 to the right position.
•Input: Use CH1's XLR input connector.
•Output connections: Use the two red binding
posts. CH1 red binding post= positive, CH2 red
binding post= negative; or use CH1 Speakon
terminal 1+ and 2+ (1+ is positive).
•Use CH1's LF filter, clip Limiter, and gain
control. Set CH2's clip limiter to the same
setting as CH1's.
SRA amplifier
CH1 Input
XLR or RCA
Mode switches
set for bridge
Do not useCH2
input! CH2 input
is internally
bridged with
CH1.
Bridge Mode: mode switches 4, 5, and 6
to the left, and switch 7 to the right.
CH1+
Output
Single, high power
CH2+
loudspeaker
Output
17