I cant answer that directly, but I hust hooked up an Audio Research LS-3 with my 4b and its a great combo. Better than the BP20/25 that I had. Great deal for 600-700$
I had this combo for one year and it sounds great. I prefer the preamp in active mode though. Just upgraded to 4BSST and it is even better. Have to spend a lot more to get better.
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