I have only heard them. They were playing Quad 22L, which is a fine speaker, but hardly full range. I am very familiar with these speakers. I have never heard these speakers play any better. I did not think they were that fast, had as tight a bass, or as open and extended highs. Quad dynamic speakers fall in the "accurate" camp. With some SS amps this means that the 22L can sound a little dry, annalytical and also bright. I heard none of that when the V4s were driving them. The sound was very refined, but very quick and immediate, not harsh, but real. It was a bit closer to the sound of AN equipment-that's the only way i can put it. I was right there with the music. I won't say anything about the mids, because that is hardly ever an issue with tube amps. But OK, the mids were smooth, refined and detailed. I hesitate to say, warm.
You might also take a look at their new Triode amp. I have not heard it, but if you can by with 50 WPC (but with huge rails), I am sure it also sounds fantastic.
