This is the scheme diagram of passive surround circuit. Passive surround doesn’t need any active components and power supply to make the circuit works. The circuit just need the combination of resistors and electrolytic capacitors.
Circuit Notes:
Loud Speaker Position:
LF : Output > connect to Left Front Speaker
RF : Output > connect to Right Front Speaker
LR : Output > connect to Left Rear Speaker
RR : Output > connect to Right Rear Speaker
Switch operations:
1 : Quadrophonic
2 : Surround
3 : Stereo (passive surround deactivated, Rear Speakers disconnected)
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