I am running my X1/Grand Slamms with Gryphon Class A amplification. I have heard these with ARC Tubes and heard the Alexandria with Krell Evo Ones. I prefer the sound i have to both, and would not trade it for tubes that i have heard to date despite being extraordinarily tempted by the Lamm 2.2 monos at one time. I might be tempted by CJ ART, but with the Gryphon Colosseum, i have not even bothered to inquire.
As Steve says, its a personal decision at this level of quality. It also matters what else is part of the system.
You do have tubes in the path to ameliorate any potential harshness.
Are your amps Class A?
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