I want to install a whole house stereo system in a house that I purchased new 15 years ago. Currently, it has a mono M&S music/intercom system throughout.
I have a Pioneer Elite 7.1 surround system in my family room; a Harmon Kardon 7.1 surround system in my basement TV room; a McIntosh MC2600 600wpc Power Amp, McIntosh CD player, McIntosh Tuner, and McIntosh Audio/Video Control Pre-Amp for music in my stereo listening room; a Pioneer SPEC-4 150wpc Power Amp, Soundcraftsman Pre-Amp, Teac X10 Reel-to-Reel, Techniques MK1200 turntable, and some other old school pieces in my basement card room. I want to hook all of this together and add to it some better ceiling mounted speakers. I plan to to install 3 pairs of stereo speakers (6 speakers) - one pair in my breakfast nook, a pair in the master bedroom, and a pair in the upstairs foyer hallway.
I considered purchasing a couple of stereo amplifiers to power the new ceiling speakers, but I was wondering what would happen if I connected the McIntosh MC2600 up to an impedance-matching speaker selector to drive the 6 new ceiling speakers? Other than being a waste of a wonderful amp, what are the down sides?