Actually, I did say the benefits of bi-wiring were none, which isn't true. Greebo's first comment is indeed correct, basically if one does not bi-wire, then only the woofer would be used on the speaker. To connect the bridging plates on the speakers, is to bi-wire. So with no bi-wiring, only one of the speakers drivers is being used.
What I was trying to get at, the benefits of bi-wiring from the amp are none, as that is the equivalent of using the bridging plates at the speaker. A common integrated stereo amplifier with 2 sets of binding posts, the posts will be joined together inside the amp, which is something that some people do not realise. They think that the 2 sets are independent, when they are not.
Unless the AVR supports bi-amping, then there isn't much point bi-wiring IMO.