Am using my X3 special edition (500w plate amp, special giant cap for tweeter, same as Don Sachs one and Clayton's personal one) with the Aries Cerat Genus integrated amp, all 25 watts of it. Amp blows the roof off the speakers but then again it is a 67kg Class A SET amp, a rare beast indeed. Bass goes flat to 30Hz at least on my test tones CD and SPL meter, bass setting is 1 o'clock on the amp faceplate, anymore and it is both overpoweringly elevated and the amp clipping light comes on so I must be dumping close to 500 watts on peaks into the woofer at one o'clock setting. I do listen pretty loud, typically 95-100dB peaks, get a bit of tinnitus at the end of a rock listening session but hey its worth it for that visceral feeling that I'm 25 again. Wouldn't choose to change these out even though my first love is Stats (clearly I'm polygamous).