Based on my experience with my Bryston 4B-ST and 5B-ST amps, I think that the "ST" line essentially reproduces accurately whatever is on the recording -- good or bad. I recall a remark by Stevie Wonder about the Bryston amps he uses in his home recording studio: they reproduce sound the way he has heard it in his head, which no amp ever did before for him.
I can't comment about the new "SST" line, but if you want a very neutral, transparent, accurate amp, the 4B-ST sure does the trick.
I can't comment about the new "SST" line, but if you want a very neutral, transparent, accurate amp, the 4B-ST sure does the trick.