Nah, I am a new comer, just getting back into high end audio after a 25+ year absence. I am anxious to try it out.
How is the 503 working out for you? I would have loved to gotten one of those, but the 501 was the deal that came my way.
Trying to figure out the difference in the two units... I like the black knobs and black side panels on the 503, but the silver of both on the 501 is not terrible.
I know the 503 uses the VERITA AK4490 DAC while the 501 uses two BurrBrown 32-bit DACs per channel. The difference in the DACs I could not tell you. Both are dual monaural throughout. It looks like the 503 up samples PCM to DSD while the 501 only up samples PCM to 192 kHz. It also looks like the 503 has added still point feet. Maybe a little better headphone section which does not matter to me because I will listen to headphones through the McIntosh. They both look like great units!
I just found a review on the UD501 by The Absolute Sound... here is his conclusion:
"the TEAC UD-501 is an extremely impressive DAC. It plays every audio file you could conceivably think of, and does so while cocking a rather large snook at companies that insist DSD replay is only possible at great expense. An integrated streamer aside, I can’t think why anyone would want anything more than this. Strongly recommended!"