You may want to contact Mikey Fremer at Stereophile. He just reviewed them but he had many high end amps on hand that he did not mention in the review along with the Halcros, his MF amps, Pass mono blocks, Musical Fidelity new mono blocks, etc. I heard then with the Pass monos and they kicked aces but I think Mikey may have preferred some other amps to the Pass. He liked them almost enough to buy them and I think he feels that they are the second best speaker he has heard in his own system.
Happy Listening.
Happy Listening.