Thanks for the knowledge!

I can see that. I actually cut my lows a lot when using the BT2, and I probably will with the BB2 also. Since they go so low, the lows are still there, just attenuated. I find it makes the cabinet sound much more "alive". Are you able to get that quickness and punchiness in the BB2 using eq or HPF?That said, at quieter volumes, I found a quickness/punch/feel in the SM that isn't there in the BB2. It was more of a response/feel thing than anything particularly different in the tone; almost like adding a transparent compressor. It is a subtle difference, not night and day. I do prefer the SM.
I like the clean and bright speaker to properly reproduce the fat tubeish sound from the amp. It seems to work in the mix.Obviously, the BB2 compression driver is superior to the SM tweeter, so if you play clean and bright, you'll get better quality and dispersion from the BB2, and the crossover will behave a little differently. Again, not night and day.