Overtime, I have driven my Soundlab U3’s with Bryston 7B’s, Cary V8’s, Wolcott Audio Presence220’s, and now PS Audio M1200’s. Each one of these amps delivered better SQ than the previous one. The Wolcott’s were great, but the M1200’s are better in every aspect. Effortless sound, top to bottom. If you want to hear what the M1200 beta testers say about these amps,there is a 15 min video posted on the PS Audio website. The M1200’s have a Class A zero-feedback, fully differential tube front end and MOSFET outputs. I immediately noticed an effortless and more engaging listening experience, with gobs of inner detail and punchier bass. One of the most noticeable improvements was the “PRAT” factor (pace, rhythm and timing). Foot tapping, head nodding rhythm.