Bobf1717, I have the Dac2 and the Sonos ZP80. I also have a Mac Mini that I use as a server via USB to the W4S. Sonically, the Asynchronous USB of the Mini is superior to the Sonos, but the Sonos user interface is much, much better. Cullen offers an I2S via HDMI mod to the Sonos, which they haven't publicized for some reason. it's less expensive than the clock/power supply mod, and should equal or beat the USB out. Give Rick or EJ a call for more info. I'm going for it as soon as I can get around to shipping the zp to them.