This is a passive surround audio circuit for better audio environment for your home audio system. The schematic diagram is very simple, it just need the combination of resistors and electrolytic capacitors.
Passive Surround Audio Circuit Notes:
- The rear speakers must be full range type of speaker. Do not use woofer or tweeter speakers for rear speakers, you'll bad audio environment.
- 5W resistors is a must, the 1/4 or 1/2 watt resistor will burned.
Source: Passive audio surround