The best sound I ever got from the KEF LS50’s was with the AHB2. However, the LS50’s does not have much bass but is still rather good in a small room Now if a speaker can benefit from 2 AHB2’s, and a lot can, then that is another story.
I just listened to Linda Ronstadt’s Greatest Hits on the CS3.7 and single AHB2 and it sounded wonderful. I actually listened to it 2 times since I enjoyed it so much. However, listening to things like Zeppelin leaves me wanting more power.
I am keeping the AHB2 for its great synergy with my KEF LS50’s. I have decided on getting the $6K (less from a dealer) Coda #8 V2 which is 250 | 500 | 1000 at 8, 4, and 2 Ohms. It is also a little warmer (12 watts Class A) than the AHB2 which I think mates better with the Thiel CS3.7’s top end.