Looking for help... I just moved into a home that has 5 sets of built-in speakers in various rooms(don't know brand). I also have Bose 201 front and Infinity center speaker. I haven't set up my rear speakers yet. My Onkyo TX SV515 ProII doesn't seem to be able to power all of these. I do have an additional receiver if necessary. Any suggestions on the proper configuration? Thanks, Moon.