I am in the process of getting 3.6s and some Bryston love for them.
I have auditioned the (new vertical crossover box) Magnepans with the Bryston 4B-SST2 at my local dealer.
The sound is a quantum leap better than my current Forte' and B&W 805s.
The snap, clarity, speed of the whole spectrum (except mid-upper treble) was astounding.
The treble was only the equal of my current setup though.
I listened to another amp with the 3.6s (a McIntosh) and it SUCKED big time compared to the Bryston. The Mac was old school no clarity, no snap. sort of flabby.
Anyway, The 7B-SST2 is just twice the juice of the 4B.
If you go to audioasylum planar asylum and scroll down to my post on 3.6 in an apt one of the posters has a photo of HIS system with 3.6's and a pair of 7B's biamped with some tubes for the top.
If you cannot audition the 7B abd 3.6.. trust me, it is FANTASTIC. (with the exception of just fairly good treble)
I am very, very emanding of perfect treble, so if you aren't, the combo is made in heaven.
I plan on buying the 3.6 and 4B