I received my Sit-3 and fresh out of the box it was pretty rough, grainy and lacking in detail. But with some hours on, WOW, what a transformation! I am only at maybe 10 hrs now, but very impressed with it and even though I have a return offered if I don’t like it, there is no way I would send it back. For comparison I have a Ref6/ref75se combo, and ANK Mentor/L4 monoblocks and this absolutely is at the same level, just a bit different flavor. Historically I have previously had from Pass/first watt a 250, 30.8, f5, F7, and sit-2. The most impressive of those was the sit-2, but 10 watts was just not enough for my Devore Nines. It was impressively clean and detailed but a bit lean. The sit-3 sounds at least as clean, fuller bodied, more “present”, and much more powerful. It sounds very natural and realistic, voiced perfectly. Brass has the perfect amount of detail and bite. Voices are as natural as they get, and full of inner detail.
It does benefit greatly from a better power cord.
Great amp!