I,m also intrested in this answer because i, contemplating upgrading to either of them from a Bryston 3bst.
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I did this exact thing about 1 1/2 years ago after having Bryston equipment for 6 years. A big, big leap up in sound with the highs more refined, bass more articulated and the lushest midrange I have ever had. One difference though. I had purchased the Pass X1 preamp about 6 months prior. Take the next step. You'll be more than satisfied.
Holy crap. I switched a Bryston BP26 in place of my MOON P5 preamp, and the difference is astounding. Perhaps just a question of synergy, because the P5 is an excellent pre in its own right, but now I find the 4B-SST is definitely a keeper.
I had read a couple of reviews in European magazines where they basically were saying that the BP26 is truly an exceptional pre, and I have to agree. Looks stupid, in typical Bryston fashion, and certainly not nearly as good as the P5,but man does it play the music. More openness, clarity, better imaging, coherence, precision - you name it.