Bi-wiring removes that gold plate in between your inputs which is nothing more than a big inducter that hurts sound quality. I personally own Klipsch RF-5's with the RC-7 center and RS-7 surrounds and RSW-15 sub, and im using an NAD T761 reciever to drive them all of them are biwired. And even though the NAD has no support for it by simply running two leads off of each output sound quality has been greatly improved. It adds a lot more air to the top end and a touch more mids and also helps to deliver stronger bass. BTW im using all kimber 8tc speaker cable which will help a lot if you are using something cheap like monster cable. I sale klipsch and NAD products and have seen many biwired and non biwired setups and anyone that can hear no difference needs to get their ears checked