Nice try, but installing Vista creates an electromagnetic field around your speakers, and if you try to turn them off, you get zapped. If your speakers are not turned on when installing Vista, then Vista will turn them on for you, like it or not. :O)
Oh No! I got an Altec Lansing set that has an active board that's not really isolated. Ergo, I can move
wires around to pickup, or not pickup, an FM station, even when the "power" switch is off.