I own the X-2 Alexandria which I drove initially with ARC Reference 600 Mk lll and now with the Lamm ML 2.1...the first amp at 600 wpc push-pull and the second an SET at 18 wpc. Bear in mind that the X-2 is rated at 95 DB so suffice it to say that not only is there enough power to drive the speakers with the ML 2.1's but I can do it to near ear bleeding SPL. Only once have I made the amp clip. IMO the Lamm is the finest amp I have ever owned. The only way I would sell it would be to buy Vladimir's new ML 3 SET which
puts out 32 wpc in pure Class A. I am presently auditioning this amp in my room now and I can tell everyone reading this thread that this amp is the one against which all others will be judged. I have heard the Sigfrid and the ARC 610T and they are wonderful amps but don't come anywhere near as good as Vladimir's new ML 3. Only problem is they are $139K so start saving your money because to own this amp is to have reached audio nirvana.