A-BUS 4000 multiplex Hub 4 in 8 out with 1 P/S
uses 1-4 AB2 and 1-4 AB1 for 4 sub zones (need additional P/S)

4-Zone/8-Room A-BUS® Expansion Hub

Different music in different rooms. With an ABH 4000 hub and up to four different input sources (including your Harman Kardon® AVR), you can easily divide your house into four separate entertainment zones, where individual musical tastes may prevail. Link in an A-BUS®-equipped Harman Kardon product and make its tuner, XM® Radio and The Bridge docking station for iPod accessible from throughout the realm. May domestic bliss and your favorite music be with you.