The Leviton HKABH Architectural Edition JBL A-Bus Hub 4-Zone System Expansion is designed for use with the HKAVR A/V Receiver to distribute a second assigned audio source to up to four rooms/zones equipped with A-Bus volume controls. The A-Bus system topology enables an Audio/Video Receiver also to operate a complete multi-room amplified system from a single location. The hub connects to the HKAVR Harman/Kardon multi-room receiver output jacks to receive the assigned audio source and distributes that signal to the A-Bus volume controls located in different rooms. The hub supplies power to the entire A-Bus system as well as manages IR remote-control signal routing. Harman/Kardon offers the ability to connect with an A-BUS hub and amplified volume controls. This makes it possible to add multi-room music distribution right off the back of a compatible receiver. The 4-zone A-BUS hub connects quickly and easily to the compatible interface port on the back of the advanced HKAVR receiver.