Ya bi-amping is generally used in pro sound where there running close to or above 120db and pushing the speakers to near xmax. My 100's hit a respectible 104 db in a room much too small for them when being run to their max. If you still feel the need to try this you would need at least another 7 ch power amp or 7 monoblocks. Then like audio amatuer said active crossovers to seperate the lows from the mid/highs so the amps aren't running full range. I don't know how you would run crossovers on reciver you can't place them in between the preamp and amp section sence it's all inside. At best you could run from the preouts on the reciever to crossovers then into a second set of amps which could run just the lows. The reciever would still be fullrange however to the mid/highs. Also you wouldn't have seperation of volume control either even if the power amp/s have gain control they will only play as loud as the reciever is playing. I've never seen a reciever that had seperate volume control to the preouts. The real way to bi-amp speakers is with all seperates, pre-amp to crossovers to two sets of amps a very costly endeavor.