I built a regulated supply for the BH DAC using a AMB sigma 11 single rail power supply board. It's probably overkill, but it works and was fun to build. Did it improve or change the sound? Maybe it seems a little fuller to me, but a subtle difference.
either way this is still an amazing sounding DAC!
(http://i284.photobucket.com/albums/ll38/debk3141/DSC_0049.jpg)
Debra