Dac for rock and not so good recordings Tube?

I currently have a Bel Canto Dac2 fed by a Sony cd changer for a transport,Krell Kav-300 integrated and Vandersteen 3A speakers,I am looking for suggestions for a second dac possibly a tube dac to tame some recordings (mostly classic rock) that are bright and almost unlistenable.Looking in the under $700 range used.