I want to set up a sound system in my house but I don't know if/how this is possible. I'd like to have music playing throughout the downstairs part of my house. In the living room, kitchen, and hallway towards the door. But I'd like the music to come from one central source and I'd like to control the volume of each room/space independently. Probably something like four speakers + a sub in each space. Anyone know how this can be done?