I left my original review in tact but downgraded the score to 1/2 Star.Here is the problem.Even with the chassis completely damped,starting out with quiet music the amp is damn near perfect.So musical & colorful.BUT when the music changes from soft/quiet to loud & hard the tubes still become microphonic & start ringing like a bell,then back to quiet passage & now you have a constant high pitch ringing in the music.No thanks.If your looking for an amp for low impeadance cans I would try the Little Dot1+...