Bel Canto digital amps most often the Ref 1000, I tried those amps with my own speakers and they worked really really well for my classical and jazz listening but not quite so well as the Pass products.I said pages back the "better" Class-D’s like the BC Ref-1000 will work, and probably to the owner sound fine with the op’s Thiel CS-5’s.
But "he" hasn’t heard the CS5’s at their best yet until he’s heard an amp that can do <2ohms without breaking a sweat far better, like the Pass X150.8, then he’ll know that Class-D was doing it hard.
Cheers George