F.A.Q.
Depending on how many zones of audio you wanted can dictate the price and example would be a 4 bedroom property with 4 zones of audio can start for as little as £2500.
Now that completely depends on the clients uses for the system in a home you might consider it a part of a Control4 project and you would control via that. On a commercial project it may be a centralised tablet or app from behind a bar area or office.