Passive Surround

This is the diagram of passive surround circuit. Passive surround doesn’t required any active components to make the circuit works. The circuit just need the combination of resistors and electrolytic capacitors.

Passive Surround circuit


  • Use full range type of speaker. Do not use woofer or tweeter speakers for rear speakers.
  • 5W resistors is a must, 1/4 or 1/2 watt resistor will make it burned.

Speaker Positions:
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

Passive Surround circuit

Switch operations:
1 : Quadrophonic
2 : Surround
3 : Stereo (passive surround deactivated, Rear Speakers disconnected)

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