Berkeley Alpha Reference run direct


Has anyone found a preamplifier that improves the sound from a Berkeley Alpha Reference DAC? If so, what preamp? Mine sounds amazing feeding my amplifiers direct, DAC to amps.
imgoodwithtools
The Ayre was on my short list.  It's one of the best preamps made.  I went with the Jeff Rowland Criterion.  I wanted to like the Arc Ref 5 (at the time) but I heard tube rush.  The other -Preamp on my list was the Pass.  (Burmeister, mbl  out of my price range).  
Jeff Rowland is an amazing man.  And approachable.  You can pick up the phone and call him.