I have used Bel Canto REF1000M (Class D) and Electrocompaniet Nemos (A/AB) as well as Plinius SA Reference (A)
I thought also heard a friend's Bryston AB amps drive Thiels.
The Bryston had better midrange vs the the Bel Cantos. But the Bel Cantos had better control of bass, very tight. With a tube preamp, the Bel Canto's midrange improved.
The Nemos improved further on the Bel Cantos bass control further with more authority and more meat. The Plinius was better again.
I thought also heard a friend's Bryston AB amps drive Thiels.
The Bryston had better midrange vs the the Bel Cantos. But the Bel Cantos had better control of bass, very tight. With a tube preamp, the Bel Canto's midrange improved.
The Nemos improved further on the Bel Cantos bass control further with more authority and more meat. The Plinius was better again.