I currently have a Bryston 4bst running Kef Reference 4.2s and am very happy with it. The preamp is an old Audiolab 8000c which is reasonable but will be upgraded when I stop spending all my money on scuba diving kit. I tend to run my system slightly bass heavy, it is just how I like it. I listen to a wide verity of genres depending, time and mood etc. I know the big Kefs are power hungary and have read on here several times on people using Bryston 7bst monoblocks and even 4 of them bi wired. So the question will I see a difference switching to a pair of monos vs the 4bst?