BUMP... I am really interested in this topic too so I'm hoping that some one with a good ear and some classic Klipsch speakers has some experience with the voltage source/current source feature on Sunfire amps. I love my Klipschorns and want a tube amp but they are used for Home Theater more than audiophile 2 channel listening so I am hoping that the Sunfires are a "best of both" or at least a happy medium. Thanks, Joel