This question is easier than it might seem! Properly creating 5.1 channel surround sound requires five channels for high frequencies and at least one channel for low frequencies.

The High frequency channels consist of Left main, Center, Right main, Left back effects, and Right back effects. Each speaker system needs to be driven by an amplifier channel. The addition of optional center back and side speakers allows the system to be expanded to 6.1 or 7.1 channel capability.

For low frequencies, a Subwoofer that has a built-in power amplifier will work perfect. Some preamplifiers/receivers utilize a Mono subwoofer output, others incorporate stereo subwoofer outputs. Regardless of how many subwoofers you use, the addition of low frequencies completes the ".1" in a surround sound system.

See our Interactive Speaker Placement Demo