I cannot comment on the W4S amplifier but I have owned both the Ref 9V2 SE as well as the Ref 9V3 SE and they are fantastic amplifiers.
The RFI issues were resolved with the Ref 8 or 8.5 iteration. I have never had any RFI issue of any sort.
The V3 SE is best described as nimble and smooth in my opinion. It is extremely extended on both ends of the frequency spectrum, and VERY revealing without becoming fatiguing (at least with my associated components).
The sound stage certainly became larger with the V3 SE over the V2 SE as alluded to by Vicdamone. The V3 presents music in a more integrated manner than the V2 SE, which is to say it's more musical in my experience.
Good luck with your decision.
The RFI issues were resolved with the Ref 8 or 8.5 iteration. I have never had any RFI issue of any sort.
The V3 SE is best described as nimble and smooth in my opinion. It is extremely extended on both ends of the frequency spectrum, and VERY revealing without becoming fatiguing (at least with my associated components).
The sound stage certainly became larger with the V3 SE over the V2 SE as alluded to by Vicdamone. The V3 presents music in a more integrated manner than the V2 SE, which is to say it's more musical in my experience.
Good luck with your decision.