Replacing my Krell FPB 600 amp with a tube amp

I don’t see any advantage to bi-amping in this case. That’s why my first suggestion was for tube amp(s) with a subwoofer. I, myself, am using a BAT integrated (mid & treble) and using the "pre-out" to drive a Bryston 4B3 (bass). The BAT is 150 WPC @ 8 ohms and the 4B3 is 300 WPC (twice as powerful). Since the gain of the amps is the same, 29db, the volume is the same. There is just more headroom for bass dynamics.
The crossover issue sounds like it is handled by the internal crossover of the speaker. The mid-treble speaker input just ignores any bass content and the bass speaker input ignores the higher freqs.

dweller.....My Arc Ref 6 does not have a variable preamp out...                       almarg.....Wow i would of never guessed that. Thanks...                                 dweller..... I too now dont see any advantage to bi amping                               dweller......Question....If i was going to go with tube amps , say ARC Ref 250 se, why would i need a subwoofer? My B&W Matrix 800s have plenty of bass, even more so with my Krell B&W Bass alignment filters when is called for.

You could try a higher-powered VTL amp, but I still don't think a tube amp will control your speakers as well as the Krell does.

Ozzy has some great comments that he has made about his new Carver mono's. He also started a thread here on Audiogon...

rcprince ...... I was also thinking the same thing that a tube amp wolnt control my speakers as well as the Krell. Unless i buy the ARC Ref 750se.    lak.....Thank you but im really not interested in Carver....