"I find the comments regarding Class D amps lacking “soul” very interesting when compared to good Class A or AB SS amps and tube amps. I recently purchased some Class D mono blocks to be used in lieu of tubes during the summer and could not describe the difference any better. I think Class D have come a long way in the last few years, but also feel they have a ways to go."
Well if one is willing to pay quite a bit more, it looks like the newest AGD Duet amps have achieved quite a lot!
"The AGD DUETs anchored a truly stunning aural experience, retaining perfect control of image and musical energy regardless of amplitude through continued listening sessions. In essence, and with every reference example, I found the DUETs to be a key conduit to the soul of the recorded musician." So much for the amps lacking "soul"!