I own a 4B-ST and 4B-SST2, and both sound quite different. Sort of a good thing though, as they match better or worse with different speakers. The ST sounds more exciting, and maybe less refined. It's lived most its life powering my B&W 801s2's, and is a great match for them. The SST2 is too refined, and almost sounds compressed powering the 801's. I've just had the 20yr old 4BST repaired & recapped by Bryston, and it was really worth it! (~$700)
The SST2 drives my pair of Tannoy 15's, and the low noise pays off there. The ST is too harsh on the Tannoys. It's all about system matching! I borrowed a Parasound A23, and found it too bright. I've not heard the A21 in my home. I am SST3 curious, but not in the amp market now that my ST is restored!
The SST2 drives my pair of Tannoy 15's, and the low noise pays off there. The ST is too harsh on the Tannoys. It's all about system matching! I borrowed a Parasound A23, and found it too bright. I've not heard the A21 in my home. I am SST3 curious, but not in the amp market now that my ST is restored!