I’ve had Thiels for 12 years but have since moved onto to Magnepan 20.7’s. The best amp I ever found for my Thiel 2.7s was the Pass X series and a Pass x150.8 would probably work but an x250.8 would be better. As far as "digital" amps goe, if you poke around the Thiel users groups you’ll find that ALOT and I do mean ALOT of Thiel owners were using Bel Canto digital amps most often the Ref 1000 to drive them. 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.