There are already speakers built into the ceilings of the living room, kitchen, master bedroom, and master bath. Each room has an individual volume control knob, and each set of speakers has wiring running down to that second floor and out of the wall. There's nothing to connect to those speakers in the individual rooms (aside from volume), it all has to come from that second floor.
Sounds like you want a multi-room amplifier (see, for example,
this one for $650). You then drive that multi-room amplifier from whatever source you want. Depending on your computer setup, something like a Sonos setup or an Apple AirPort Express + Apple Remote on an iPhone would feed the amp.
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