Bryston 7Bst vs 7B3

I will jump in on your query;
going from a BST to SST, yes, there will be a sonic improvement.
I suspect that going from a SST to B3 will support another sonic improvement. Only you can decide if the extra dollars spent is worthy.

Hi Jafant,

Wadia s7i cd player / Bryston BP26 pre-amp/ XLO bal. cables / OCOS speaker cables. I haven't seen any reviews on the 7B3 but there are some on the 4B3 and it sounds like there is a significant change jumping to the cubed series. I'm gonna order the 7b3's next week will update once I get them.

sorry have not been online in a while to respond jafant i am using a cj et5 preamp,mit interconnects young dsd dac and a modified adcom 555ii power amp which by the way sounds really rich and warm.

I am running a 4bsst2 as a centre after a previous 7bsst. The sound is better - slightly cleaner and tighter. The same difference when I moved from 14Bsst2 to 28bsst2 monoblocks (also better at lower volumes). I missed a trick here as I bought the 28bsst2s believing them to be the latest bees knees models, only finding out  6 months later of the sst3s! 
The comments I have seen say that there is a sonic improvement moving up from say 28bsst2s to 28bsst3s - but nobody has defined exactly what that is for us listeners. Easy to say, but not easy to define. I presume more of the same type of improvements moving from s to 2s
And is a 4b3 bridged better (and more flexible)  than a 7b3? Too many questions.

well, not to be rude here, but i can't stress this enough; you gotta go out and audiion, preferably a home audition. if the dealer gives you static, go to another dealer or call bryston and see if they can help you out...and to add to this is most reviews should be taken with a grain of salt...every component i've bought over the last 30 years based on a stellar review was a dud. this including some very highly regarded stuff.one exception was the b&w 801 matrix 2. great speaker that has stood the test of time, imo.