I have been anxiously awaiting Ralph’s Class D.
Am a big A-S fan and joyfully use his MP-1 preamp.
Since “going home” to Quad ESL 57s, I have cycled through several amps to find the best match for the Quads.
I have the chance to put money down to get on the waiting list (6-8 weeks) for the A-S Class D. May still do that, but have bought an ARC Ref 80S.
I was floored by the sound of the ARC Ref 160S at a friend’s. The best system I have heard. Was so engaging that I couldn’t not listen.
So far, I have decided that the ARC Ref sound may have attractive “tube qualities” that Ralph’s do not. That is, a level of organic/real.
And even though price does not represent quality, the $16K Ref 80S should be in a different league from the $5400 A-S.
This is only a guess. Not yet hearing the A-S amps. But still thinking that those tube qualities are yet to be captured by a SS amp.
As a previous die hard SET guy, that sound is called sweet. To non tube guys, it is called colored.