If you don't mind my opinion I would look at a different amp all together for the B&W's. I am a B&W dealer and Krell is not a good match. It will sound super detailed but very harsh and make your ears hurt after an hour. The following amps will make the Krells sound like Technics on your speakers. Essence, Gryphon, Symphonic Line, Ayre, Classe, NRG, Coda, White, Pilinius, Arcam, or Halo. Just don't do tubes as the woofers on the B&W's love solid state.