2-channel back-up system (but can do surround later with the installed - in-ceilings) for now - Ohm Microwalsh Talls, Rel Strata III sub, modded Oppo BDP-83, Teac DAC, Squeezebox Touch with upgraded power supply, Bryston 3BST amp and Odyssey Audio Candela preamp (which does have HT Bypass).