You will get a lot of responses from non B&W owners who guess at an optimal pairing. I have two pairs of B&W, N802’s and Concept 90’s. The W4S ST500 produces deep controlled bass and tames the inherent brightness in the top end that many amps fail to do. I have always paired the ST500 with a tube preamp, either a VAC Renaissance or Manley Shrimp. I believe that a tubed preamp is part of the excellent resulting sound. Since I no longer own a SS preamp, I cannot confirm that.
Wyred for Sound also makes an integrated amp which I have no experience with.
Wyred for Sound also makes an integrated amp which I have no experience with.