Distributed audio AKA Whole House Audio systems are ones which allow for playback and often control of music throughout an entire home or building. Until recently, only the very wealthy could afford a whole-house audio system. Whole house audio systems fall into three categories: Single source/Single zone, Single Source/Multiple zone & Multiple sources/ Multiple zone. Before you determine which type of whole-house audio system you need, you should evaluate how you'll be using that system—that is, what type of listening you'll be doing in each room. Putting together a system for background music costs a lot less than setting up multiple audiophile-quality listening rooms.
Single Source-/Single Zone - These systems distribute the same audio source everywhere--individual rooms must listen to the same audio source. This is the simplest type of system that can be installed. If designed properly, no special equipment is required other than one amplifier and a desired audio source.
Single Source/ Multiple Zone – This type features separate volume controls that are usually installed in each room or zone to compensate for differences in apparent volume due to room size and shape. This system design is otherwise the same as a single source, single zone in that all zones must listen to the same audio source, though volume control is independent in each room (and audio can be turned off in rooms, as desired).
Multiple source/ Multiple Zone - These are the most advanced and flexible, and of course the most expensive systems. Different zones can select (and often control) different audio sources independently of other rooms.
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