[masi61]

.of the Salmoline (is this how it is spelled?) circuit?

Currently I have a 4B2 and BP26/MPS2 combo with a BIT15 power conditioner. MY speakers are Thiel CS 3.6. My system is very detailed and powerful but not the last word in musical coherence. Vocals (primary and backup vocals) can be hard to decipher the lyrics at times. And interplay between musicians is not as musical as it could be. I know this based on an in home demo given a Gary Dayton at my house about 2 years ago. He swapped out my pre and power amp for the BP-17 and 2.5B-3. He stayed long enough for us to sample enough of a variety of well recorded music to where the musicality was requiring much less active concentration to follow and would flow with great richness like my original Bryston gear only better.

I think the BP-26 is kind of classic and would like to stick with this but am strongly considering trading in the 4b2 for a 4b3. Could anyone speculate for a minute on how this might impact my listener experience? I would appreciate it. Also, does anyone know if the 4b3 trade in program is still in effect? Thanks, from Bill in Dayton.

[Markwatkiss]

Very familiar with Bryston amps as I have owned multiple models over the years.From my experience the 4B3 is a more evolved design and this becomes immediately apparent.Not a fan of their pre amps,I always mated Bryston amps with tube preamp which compensated for the linear sound of a Bryston.Flesh’s out the presentation yet retaining the bass slam.
Others will have different opinions and experiences.

[Elizabeth]

I have owned BP26 and 4B-SST² since2010.
I pushed hard for recognition of the BP 26 as a World class preamp and finally Absolute Sound agreed.
When I replaced my Magnepan 3.6 with Magnepan 20.7 my dealer convinced me I did not need to also move up to a 4 cubed amp.
Instead he suggested a Marantz CD player. The $7K one I forget the model.
I also splurged on Kimber KS1116 and KS1016 wires. the run from pre to amp is $3,200 alone. well worth it to me.
Anyway after spending $20,000 more including thousands to get the Speaker resistors just right...  I got stacks of wood, tuning.. bought piles of Furutech outlets. and moved stuff around.
To get the vocals to become coherent was the wood. Putting everything on wood and or exotic.The amp in particular I put up on a hard maple on old TipToes, top of Maple a Walnut butcher block and the instead of on the Amp feet amp resting on exotic hardwood bowl blanks.
The speakers themselves the large oval bases up on several 2x2 Bloodwood lengths. (to keep those tuned right and not dampened by the carpet they are up on 1/2 by 2" by1/4 maple bits.
Anyway after getting the right response for the room in general basically on. I used well known Female vocals same ones and repeatedly played them over and over to find the perfect toe in. When the voacals locked in as one clear sound I stopped messing around and measured those exact distances. SO the speakers can be placed precisely where I found them to be perfect.
Now several years late still very happy with the quality of the sound.

So the questions BP26 Good Hell yes.
Stay with 4B-SST² no problem 
Improving sound with even more AC stuff. (Furutech duplex)better aftermarket AC cords,  IMO tuning with exotic wood was my best answer. Started with Michael Greene's idea of tuning and took it in my own direction. Butcher blocks under everything various exotic wood bits under everything as feet some under stock feet better.. I did a lot of experimenting there.  some butcher blocks doubled up. Best ones doubled up were Turntables and amp (surprising me was how amp was improved)
Anyway that is my two cents.
And finally seeking better vocal coherence was mainly toe in and very small adjustments to speaker position.