best-sounding class D amp?
Look at PASS amps much better than classl d pass on class d maybe in 10 years it will get better.
Best one I’ve heard so far had been at our club audio meeting, the Belcanto Ref 600M monoblocks which use Hypex NC500 with I believe their own buffer, they were very good into a very high end two-way that used the top Raven ribbon tweeter "almost" livable for me.
Then we put them on a pair of B&W 803D3’s and they were not as well received, upper/mid highs were a touch hard with glare yet subdued at the same time, we concluded that the Ref600’s liked the pure resistive loading that the Raven Ribbon gave around a constant 6ohms, but not the more complex loading the B&W upper range had, because the same B&W’s sounded sweet as with a Pass Labs linear amp we also had there.
Cheers George