Originally Posted by cel4145
That's very weird. Did you rule out configuration issues and perhaps a bad optical cable? Did you see if the Zune has a configuration option for choosing between bitstream, PCM, or even 5.1 audio vs stereo? The reason I ask all of this is that other optical DACs could have the same problem if you haven't ruled out all the possibilities that are not the DACs fault.
In a word, yes. I swapped out the toslink cable, I took out the D03K and swapped in a panasonic receiver with optical in and internal DAC (all else remaining the same) and got sound, I removed the DAC/optical setup and ran direct line out to the Topping amp and got sound. So I'm pretty sure it's either a bad DAC or the signal compatibility between the D03K and the Zune.
The Zune's sound menus are very basic, it really doesn't give you any options as far as how the optical output is formatted. I am going to have to assume that is is some manner of Dolby signal that the Fiio can't handle.
I'm thinking that either an Orei D34X or or maybe a Fiio D07 may be my next step.
But I'm open to all suggestions.