whats the best pre amp to pair with Bryston 4b cubed? A

with high level separates it is usually a 'no regrets move' to pair same make pre and power

everything else was not designed specifically to mate, even if they do that fine...

exactly my bafflement with lack of love for BP 17 cubed.

Wdve thought it a no brainer all things being equal paired with a Bryston amp.

Anyways thanks for yr comment jjss49 and all the other posters as wel 

don't worry about naysayers if you like bryston go for it, they are a quality outfit

I tried a set of 7b3 monoblocks in my system at one point in time.  It turned out to be pretty good after an internal fuse upgrade, but the overall sound was thin in bass, midbass, midrange.  I would pair this with a very thick sounding preamp with heavy on the midrange texture and warm slow bass.

Long time Bryston owner of multiple iterations of their amps.Tube pre amp is essential to flesh out the linear presentation and provide that deeper richer musical presentation.Always used Audio Research tube pre amps,well documented history between that marriage.Of course there are other accomplished pre tube pre amps which will meet your needs.