The Bel Canto R500 Mk.2 -- being slightly on the warmer side of neutral -- is the only reasonably priced class D amp that I would suggest for driving the B&W 804s. As these speakers appear to be on the leaner side of neutral, there is the danger that slightly lean sounding class D amps like the JRDG 201 may exacerbate the situation. In the regular SS domain, I suspect that some of the smaller Pass XA or Aleph models may also work very nicely with the 804s. In the tube amp domain you may try to look at classic amp designs that fit in the warmer side of neutral.
Have you consider that the issue may be with wiring instead of electronics? What power cords, interconnects, and speaker wires are you using?
Guido
Have you consider that the issue may be with wiring instead of electronics? What power cords, interconnects, and speaker wires are you using?
Guido