Pros: Play DSD, excellent headphones amplifier
Cons: Major problem happens sometimes over USB
This will be the second review on this product that needs, by seeing the number of review, to be discover more! I was searching a DAC for our home-theater/audio setup. Composed by 3 Totem Tribe III because the rest of the family is more axed on the movie section I took an Integra 70.5 for the amplification section but I wanted to bypass its DAC. My retailer in Québec as a 100$ off on the UD-501 and for what it can do, I jump on the occasion. The support of DSD was a benefit for me because I have a lot of DSD music that I ripped on my NAS and the only way to play it was to send the audio via the HDMI connection of my computer to the amplifier directly. I compared the sound to the integrated DAC in the Integra (not a bad one at all for a receiver) and the sound is more rich in the high. I use the UD selected to "sharp" with my MDR-500V and it acts very good as an headphones amplifier. I compared it to a PS Audio PerfectWave DAC both plug into a Power plant P10 on my main system and the difference isn't so big compared to the price difference.
The only recurrent problem was, not very frequent, the sound grish like in this video: https://www.youtube.com/watch?v=Bhf4uxY-tck
Like in the video, changing the input selector to Coax and going back to USB resolve the problem but it's annoying... Maybe it's my USB cable that came with an HP printer... Next purchase!