I've been using my PS3 as my music server and using the optical out to connect to my Emotiva XDA-1 DAC (via dayton glass toslink).
Today I decided to take my NAD T534 and use it to play some CD's via the coaxial output. I don't know if it is a cable thing or a transport thing, but the NAD via coaxial was a definite improvement. Things sounded sweeter, open, and their was more bass. It was subtle, but it was SURE.
I'd like your thoughts on this if you have any.
I have been trying different transports with my recently built DAC and agree they can make a difference. Power supplies, cables (power, digital) and even the laser and drive mechanisms can have an effect on the sound from what I've heard with my ears.
My theta sounds a lot better than my PC.