I recently purchased a set of RM7600 w/ PSW650 sub. I'm using a Sony STR-DE935 receiver. Does anyone have tips on adjusting the frequencies levels on the individual speaker settings on the reciever. (Front, Center, and Rear) For example, the center channel treble, mid, and highs, as well as the front treble, mid, and highs and the rear treble, mids and highs. I have tried adjusting them to my ear but come up with something different everytime. Just getting started so any advice would be much appreciated. Thanks!