We represented Usher for several years and, in our experience, they performed best with high current, slightly warm solid state amplifiers such as Pass Labs, Simaudio, and Ayre.
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I used to have Usher Be-20. I think it also benefit from amp with higher damping factor. Something like Lamm M2.2 which has enough wattage to play as loud as I need does not control the bass quite as well as I would have like. Lamm's damping factor is a bit on the low side at 82. While you don't need amp with damping factor in the thousands to ten thousands like Soulution or Karan, damping factor of a few to several hundreds probably would be enough.
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.
I run my BE-10 with MUSIC CULTURE MC-811 and MC-601 pre-amp. Truly amazing. MUSIC CULTURE has been created by the founder of MBL. Same sound without the price's extra zeros... Even if it's not cheap at all! The MC-801 power amp is also damn good for a low price, even better than 4 times more expensive electronics.
The sound is emotional and i didn't find many electronics able to do such things with so much evidence...