This is a replacement for a similar unit that needed to be replaced since Bose no longer will repair this item. It simply plugged in to existing wiring. It saved me $$$ that it would have cost to rewire the house to accommodate a new more modern unit. New Bose units do not have a B channel to have music in 1 area of the home, while the TV is playing in the family room
The system was great when initially purchased. It is now too old and is no longer is serviced by Boise. It is also a stand alone system and can not be combined with any other.