I was minding my own business, visiting My Kind of Music in Toronto to see the owner, John Costanzo, and pick up some replacement brush/rollers and detergent for my Saidi Audio ultrasonic cleaner. As I was winding up with John - having just completed the latest in our very long series of conversations on all things audio, Lawrence Mitner walked in. Lawrence is the Canadian sales rep for Adcom and for Red Leaf Marketing (that distributes the superb Belles Audio components in Canada). Lawrence brought with him the latest Adcom 555SE power amp, and the latest (monster) Adcom 585SE (85 pound behemoth with a 1.7kVa power transformer). John set up the 585SE first and 555SE after about 45 minutes with the big thing. The 585SE is quite something at its price point. 400W per channel. It's got a solid grip on bass, drove the Wilson Benesch Cardinal floor standers quite nicely, and fully fleshed out a wide variety of jazz, orchestral classical, and so on. It's a brute that can handle just about anything. But . . . to my ears I felt it was a bit congested in the midrange. Nonetheless, it handled the a glorious recording of Milt Jackson on well-recorded vibes in full voice - a notoriously difficult thing for any amp to do - especially with '60s vintage LPs that mastering engineers had to push hard to capture all that resonance. Bass, drums, piano, horns all sounded realistic, full, and give credit as well to the superb EAR preamp. Source was an Origin Live Resolution turntable with its Encounter tonearm and I-forget-what cartridge. The new Adcom 555SE was the real treat. 200W per channel. What a delightful power amp. Same speakers, same preamp, same turntable, tonearm and cartridge. The sound was freer, livelier, more engaging. This is the one that really got things going for me. It's still a heavy chunk of aluminum, rear heat sinks, and so on, and it's easily as fast and rhythmic as its massive big brother, and seems even more nimble. It's so easy to listen to and be drawn deeply into the music by this amp. I think the new 555SE is a home run for Adcom. It has a huge helping of the Nelson Pass sound that originally made Adcom so popular, but now it also has a huge helping of superb speed, dynamics and detail, along with a musical clarity that is absolutely engaging. At a retail list price of ~$1800, I think it's a genuine bargain, and I highly recommend an audition. The EAR preamp is in the background right, the Origin Live Resolution immediately above. The Wilson Benesch Cardinal speakers are the tall floor standers flanking. The Adcom 555SE is on the light wood platform lower left. The 585SE is on floor in the middle.