I'm looking at the Cerwin-Vega XLS Series speakers. I understand the basics of audio quality and set-up, but I can't figure out how to pair these with an a/v receiver or whatever. All of the speakers have different power ratings from low (125w) to high (500w). Those are peak power ratings but nonetheless, how is a receiver dishing out whatever (165w x 7) going to power these different speakers? Won't some be extremely loud and some quiet? Do I need to use a different means of amplifying? I wan't this speaker combination to work in my house somehow. Any help would be appreciated.