Wireless avoids all of this ground loop stuff and you are not running audio wires everywhere. I do question how well blue tooth will work if you have a fairly big house. I have a blue tooth pointing device on my TV PC and the range through walls is quite a bit less than the advertised "8 meters". I am using an 800 mz solution (the RCA system) for wireless audio and my head set works fairly well anywhere in the house and around the yard. I have the transmitter in the front window so it also works about 100 yards away when I am walking the dog. You can use multiple transmitters but they usually end up on different frequencies. That might be handy if you have different sources.
I have a set of wireless speakers we set by the spa if we want "living room" music out there (or just about anywhere else). I have a wired set of speakers for "tiki bar" music at the spa.
