I own a BE-10 with MUSIC CULTURE MC-811 power amps and MC-601 pre-amp. Truly amazing. Bass are deep and controled, medium is holographic and magical, highs are perfectly integrated to the whole stereo image with maximum smoothness and details. Evidence is the word.
The BE series are truly the more accurate, natural and transparent speakers i ever listen to. The problem is that they are very dependant on the associated electronics.
I tried those with differents electronics from tube technology to solid state. CLASS A power amps work fine with it. I think that's why USHER Audio created the R1.5 to match their speakers. I own 2 R1.5 and it was very good for a low price. PASS LABS is also great depending on the model.