PS. Is there a huge difference in sound between the Bryston 3Bsst and 4Bsst?I believe the 4Bsst would have double the power of the 3Bsst (150 vs 300W). You will notice a hair more ’control’ in the music with the 4Bsst. But nothing earth shattering. But when pushed to the max the 4Bsst will be better. Again not earth shattering IMO - just a bit louder.
Best would be to demo them yourself.