Theta all the way. For the posters with the negative sentiment, I would chalk that up to something else problematic going on with your system that the Theta is revealing, whereas the other amps are not capable of actually being that transparent. The Theta Intrepid is one of the most transparent amps ever made. It will indeed reveal any and all problems, most of the time due to inadequate AC power to feed the amp. Of course, putting a lesser amp back in that "hides" the issue *is* another solution I suppose...