[QUOTE=BigBear;297978] or patching them into holes in the wall affect the audio quality?
You're not serious are you ? The wires are patched into the walls, the speakers are ressessed into an opening in the wall with the grill exposed.

On wireless setups, how long does the battery typically last? Will the signals interfer with other electronics? (Pace maker, wireless internet, etc?)
The wireless units are Ac powered at the back of the room and have a IR receiver and short wires to the rear speakers, the main receiver has a IR transmitter. Draw back, it must be line of sight.