I plan to purchase three QSC RMX850a power amps to bi-amp my 3 front speakers and use the Marantz SR5010 as a preamp-pro. I already have a pair of EV 7100's for driving the surround speakers in a 7 channel configuration. My HT system will have a lot more power than with the AVR, but before, I was driving Altec A7 components with a 99dB sensitivity which I replaced with the following three-way systems (87dB sens.). Finally, I will have less SPL available than with Altecs, but I don't listen to very high sound levels, mostly classical and jazz. Actually, I have built 3 identical 4 ohm three-way speakers for the front channels consisting each of one Dayton RSS390HF-4 sub, two Peerless HDS P830991 mid-woofers and one Airborne RT-4001 Air Motion Ribbon. The enclosures have a net internal volume for the subs of 7.5 cf and they're tuned to 16 Hz for an F3 of 20 Hz. Active crossovers will be at 190 Hz using DBX223XS and passive x-over will be at 3600 Hz. Back to the QSC amps, a friend of mine plays with a band and has used many brands of pro amps, and the only brand that he couldn't kill was the QSC. That's a good plus for them. When I have got acquainted with the new amps, I will surely let you know how they perform. This should be before the end of this year, my fellow Canadian friend.