B&W 804 with ???

I would suggest a nice hybrid amp -- one with a tube input stage and a powerful (at least 100 Wpc) MOSFET output stage. With a little luck and maybe a little tube rolling, you should be able to tailor the sound to your taste. Counterpoint, Jolida, Anthem, and other companies make hybrid amps that would be suitable and within your price range. The right interconnects can make a difference too, so don't ignore that area.

An alternative way to go would be to get a nice tube preamp and use it with your present Acurus amp. There are many choices here, and at all price levels.

Good Luck!

I'd go for a either a MOSFET/tube hybrid, a 50 wpc Class A SS amp or a strong tube amp. I've run my N804s with a couple of 16 wpc 300B SET amps and a Sugden Au51P power amp, and they just sing. A used push-pull tube amp mated with a passive line stage might be just the ticket.

For hybrids look at the various Blue Circle amplifiers. Currently BC24 and BC28, but also a used BC2 Mono's and the BC6.

Among the various speakers Blue Circle uses to demo their designs, it includes the Nautilus 804.

Are your 804 matrix or N series speakers? B&Ws are not bright speakers. The Halfer amp can be reasonably moded by Musical Concepts and they would sound great. I would say experiment first with the Halfer mod. B&Ws generally come alive with high current SS amps especially if yo uare going to really rock out. Borrow a different preamp to see what that does to your system. Other amps that work well with B&Ws, Bryston 4s, Krell KAV-250 come to mind for loud rock. What cables are you using?

Happy Listening.