I use the raspberry pi along with a hifimediy sabre 9023 dac (adaptive). I dont have the usb powered version but the following:
hifimediy.com/index.php?route=pr … duct_id=87
with an external psu:
hifimediy.com/index.php?route=pr … uct_id=108
and to be honest I am very satisfied.
I have done a/b tests with a cd player (advance acoustic with nos tubes) and although the cd was the winner, the difference was not huge and I have to admit that the above dac was one of my best purchases ever.
No i am waiting for the updated async version to build a second rpi based system.