Pjohri, you may want to try to a/b the ethernet to your zp-90 through the dac against the usb from the NAS to the dac. I personally think that ethernet is still the way to go. A lot more low end and a cleaner more detailed sound. I don't get what the fuss is over USB aside from people wanting their computer to be the primary server. My computer will never be used as a server. And I rarely use my NAS either. I still prefer cd. And that's going againt a PS3. If people are saying a NAS to a dac sounds better than their $4,000 cd transport to dac then they paid way too much for their transport when they could have spent $300 for a PS3 which I think sounds damn good with my Cary dac.
BTW, don't know if this matters to you but I run optical out from the PS3 and the standard digital (non-optical) output from the Sonos. I would run both optical but I only have one optical input on the dac which is a slight let down. If you need more of an idea of what I run I do have it posted in virtual systems. Might help for comparison. Good luck with your DLiii. I here the mods really do make a world of difference too.
BTW, don't know if this matters to you but I run optical out from the PS3 and the standard digital (non-optical) output from the Sonos. I would run both optical but I only have one optical input on the dac which is a slight let down. If you need more of an idea of what I run I do have it posted in virtual systems. Might help for comparison. Good luck with your DLiii. I here the mods really do make a world of difference too.