Pyramid Car Audio PB 610 SX - Manual (Page 9)

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CONNECTIONS
PB310SX
PB310SX BRIDGED MODE
SPEAKERS NEGATIVE TERMINALS ON AMPLIFIER ARE NOT USED IN BRIDGED
MODE BRIDGING IS DONE BY SUMMING POSITIVES.
CONNECT THE NEGATIVE SPEAKER TERMINAL TO THE POSITIVE TERMINAL OF
CH2 (R-CH) ON THE AMPLIFIER BE SURE TO SELECT BRIDGED SWITCH KNOB FOR
PROPER OPERATION.
CAR SIGNAL INPUT (RCA LINE OUT) MUST BE CONNECTED TO ONLY EACH "L"
CHANNEL (BRIDG SWITCH KNOB SHOULD BE SELECTED MO). IF CAR SIGNAL
INPUT IS CONNECTED TO "R" CHANNEL THERE SHALL BE NO POWER OUT (NO
SOUND).
BRIDGED MODE INPUT WIRING