Thanks for the info, but in some ways I am just more confused.
What is digital vs analog vs optical? To connect my CD player to my receiver I have 2 options: A single optical (TOS link) cable or a double (R and L) cable. Are those "digital" or "analog" or something else?

I don't know about the impedance calculation, but when I switched the receiver to a lower impedance setting, the situation improved dramatically. Here is a link to the "switcher" - actually "speaker selector" - I got the SDB 4.1.

http://www.russound.com/speaker_selectors.htm

It seems to work fine, but the connections are limited to 14g max and I wonder if that is enough for optimum sound (I know, here goes the cable debate again, but if I'm not mistaken, most people here recommend 12g - right?)

Also, because I want the subwoofer to be only as loud as the M22s in the living room, it is now connected through the "speaker selector" whereas before when I only had one room, I had it connected through the subwoofer "out" and it doesn't sound nearly as good no matter where I set the crossover. Any suggestions?

Thanks again.