In maybe simpler terms, in my case I have a 7.2 amp, and I currently only use 5.1. So I could either use the spare channels to run front height or back surround speakers, or I could bi-amp my front speakers - one set of cables to the tweeter and another set to the bass driver.the record spot said:Bi-amped just means that you are using separate amplifiers to drive the tweeter and the bass driver. In a stereo amp the power is divided between both. By Bi-amping you're splitting up the duties and delivering more power while learning the load on the amps by using the additional amps available in an AV amplifier to so this. A more technical explanation will be along shortly!