Hmmm, that makes my upgrade decision a bit more difficult since it appears the improvements to the Sig 30 address my main area of concern. One thing I did not mention is that I run my source components (CD/SACD player and phono pre) directly from the amp using the now discontinued Sig 3S source select switch and have not yet experimented with a tube line preamp in the mix. I've read that this adds more "bloom", etc. to the treble in some systems. However, I still notice the same treble characteristics whether I'm listening to vinyl or digital, despite the fact that my phono pre (Audion Trode Silver Night) utilizes tubes.
Don
Don