Bryston Preamps - What do they sound like?

My BP-6 was the closest thing to “straight wire with gain” I’ve heard — it simply passes through whatever it’s fed with no editorializing.  

+1 soix! I have a Bryston .5 in my collection. Transparent to the source is a good description. A clear window on the recording. That is how a preamp should perform! A "warm" sound is not accurate!

I had a BP-20 with MPS-2 power supply. My current Topping pre90 ($600) and Benchmark LA4 ($2600) are of similar sonic character. That is a very neutral sound. However, the Topping and Benchmark are much better and newer. They are essential noiseless and fatigue free. I cannot say that about the BP20.

A good preamp shouldn't "sound" like anything..... add nothing, detract nothing.

and therein lies the rub.... " should "....