I am thinking about getting a russound x75 to power my mains , which are polk monitor 60's.Right now I have them hooked up to my onkyo tx-sr707. The 707 is powering my mains and center, I use no surrounds at this time.Will I get better sound powering mains with russound x75 and center with...

 I have a simple multi-zone system using an older Pioneer receiver (VSXD814) to power the living room 2.1 audio, and then I'm using preouts from that to daisy chain 4 Russound X75 amps, each powering a stereo pair of in-ceiling speakers in different zones.  This setup works fine when I want to...