Hi Hifinutt - Peter here, we met at the KJWestOne demo and had a good chat. It was good to meet you.
I am no turntable expert but I am pretty sure it was an LP12 in the S3 upstairs room, and an LP12 with all the trimmings. I agree that the sound downstairs with the cheaper A3 was far superior. I suspect it was down to the nature of the acoustics of the room matched with the wonderful dcs gear, plus a pair of what looked like beautiful Dan D'Agostino monoblocks, and some cables which probably cost more than the speakers. The fact that we agree that it all sounded so much better with the A3s over the S3s when clearly the S3 will be a better speaker, showed me so evidently how the room dynamics and also the source/amp/cables are fundamental to the performance of a speaker. Given that the Linn source and arc amps in the S3 room are no slouches either, maybe it was the room we were hearing give the A3 such an impressive performance? The other aspect was the recordings chosen. In the small S3 room we were listening to symphonic music. In the official demo he carefully chose atmospheric jazz and contemporary music, all beautifully recorded. The only classical he played was Rattle's Rite of Spring from the Birmingham Symphony Orchestra from the 80s I think, which is a very well-recorded piece with great space around the instruments.
Whatever, the demo was amazing.