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.
our Interactive Speaker Placement Demo