I currently have a HT/hi-fi receiver system with an A/B speaker selection button. I have installed speakers in another room in my house, and if I am listening to music, I turn on the B speakers and can listen to music in both rooms. I am re-arranging my house and would like music piped into a third room. My question is, what would be the best way (or is there a way?)to add a third set of speakers into my system for a grand total of six speakers (two per room) for music listening Is there a way to do it with my current receiver? Would there be a signal degradation? Do I have to add another piece of equipment?