I'm not familiar with your speakers, but I have owned both the Ref 150A & the Ref 350A. I was using them to drive Vandersteen 3A Signatures. The 350A obviously provides some extra power. Which was good, as the 3A Signatures are only 88db. But I prefered the sound of the 150A. To me it was a little more open & airy. But again, that was with Vandersteens, which are not known for their treble. With your B&W's, the 350A may be the perfect match.
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