I purchased the TEAC UD-501 recently based on favorable reviews on this site and others on the internet and am very, very, pleased. I wanted a headphone rig for my PC to replace a Cambridge Audio DM+, which I've been very happy with, but I now have a fair amount of DSD files and wanted something that would handle native DSD (I have a dedicated 2-channel setup for playing SACDs and DSD files in the living room, but often listen to music on my PC, and felt that converting my DSD to PCM was not cutting it anymore). The TEAC UD-501 is a wonderful sounding DAC that IMO, competes with DACs twice its price. It's PCM performance with upsampling ON and the Slow Filter engaged has a neutral to warm vinyl-like quality; and it's DSD performance is fantastic - it sounds comparable to several dedicated SACD decks I've owned and heard.
I've been using JRiver MC for years and upgraded to v19 a few days ago and was pleasantly surprised that it now will output natively in DSD:
I've spent a few hours this weekend "A/B'ing" between DSD "upsampling" and native PCM. Having JRiver MC 19 output everything to DSD really is the way to go with this DAC! PRaT and resolution have been fantastic on good old PCM (both Redbook and Hi-Res). This DAC is simply marvelous on DSD.
Caveat Emptor: Real-time DSD output requires a fairly powerful CPU!
And, as always, YMMV!
Edited by Eagle13 - 9/15/13 at 9:39pm