Thank you gentlemen for sharing your experiences with these dac's. I'm really looking forward to trying out a tube amp w/ some old paradigm bookshelf speakers at work. Currently using a w4s dac w/ a xa-30.5 amp and c1 speakers in the den. It sounds fine although it's hard to imagine the singer is in the room frequently. Probably just a set up problem. Playing w/ these dacs should be fun! Thank you again for your time. :)