I’m not sure what the sensitivity (efficiency rating) is for your KEF speakers, but my guess is that the Bryston 3B3 will perform fine and sound great in your system.
I have a 4B2 which is a wonderful amp but I had an in-home demo of a 2.5B3 with my difficult to drive Thiel CS 3.6 loudspeakers and OMG the power was fine with my stubborn speakers. The sound quality compared favorably with my 4B2. A slight lack of detail and me having to strain to integrate harmonies from musicians interacting with each other and background vocalists were better integrated into the overall sound for the 2.5B3.
For low to medium volumes the 3B3 would be great. Now saying all I have the 4B3 would be greater-er! To be honest, I have not yet auditioned the 4B3, but I have such trust in Bryston, that when I get ready I plan to order one sans audition.
I have a 4B2 which is a wonderful amp but I had an in-home demo of a 2.5B3 with my difficult to drive Thiel CS 3.6 loudspeakers and OMG the power was fine with my stubborn speakers. The sound quality compared favorably with my 4B2. A slight lack of detail and me having to strain to integrate harmonies from musicians interacting with each other and background vocalists were better integrated into the overall sound for the 2.5B3.
For low to medium volumes the 3B3 would be great. Now saying all I have the 4B3 would be greater-er! To be honest, I have not yet auditioned the 4B3, but I have such trust in Bryston, that when I get ready I plan to order one sans audition.