After reading the first several pages of this thread, I bought a Zero. It arrived last week (about 3 days after my order - from China!). When it arrived, I hooked it up to my PC via the USB port to burn it in. This is my first dac/headphone amp, but it sounded great to me out of the box. During the burn in process, I happened to be crawling around the back of my computer, and noticed there was an audio out port. So I trotted over to Radio Shack and got an Auvio digital coax cable. I hooked up the digital coax cable and cycled the Zero (LED light changed) - no sound. USB still worked. So I figured maybe there was a problem with the audio digital port on my computer.
However, I actually bought the Zero to use with my home audio system, because my Oppo BDP 103 lacks a headphone jack. Since the Oppo was already connected to other components, the only available audio out was the digital coax. So I connected the Zero and the Oppo via Auvio cable, and voila - my HD700's were singing.
I then tried connecting the Zero to my Squeezebox Touch via the USB port, which had worked perfectly when it was hooked up to my computer. NO SOUND! To check the Squeezebox, I turned my Maggie's on, and the Squeezebox worked fine through them.
So I'm perplexed. Is the Zero designed to work with only one input connection at a time? I thought the purpose of the selector was specifically so you could choose among several simultaneously connected sources. So am I wrong in thinking there is something wrong with my Zero? Or is there some software or another "trick" I need to try to get it to play music from different inputs simultaneously connected?
If there is something wrong, does anyone have any experience with cheaply shipping something back to China/Hong Kong?