Krell FPB 300cx enough to drive B&W Nautilus 801?

I think the 300cx would be more than sufficient power to run the 801's. B&W's are fairly efficient, I have 802'S, same power requirement, and am running tube mono-blocks at 220w/channel. I am NOT lacking power, in fact I haven't turned turned the volume up past about 1/3rd. Unless you are driving music for a auditorium or concert hall the 300 would be fine.

The 300cx is PLENTY to drive the 901's to levels above 100db. How many people listen to music that loud? :O

I am a no count nobody from nowhere when it comes to Hi-Fi equipment, but I have been studying very much to understand how it all works. I am getting into it all and have purchased a set of B&W n802 just recently. To my understanding with all my research, I have discovered that the increase in watts pr channel isn't about more volume. It's about the quality of the sound at all volume levels.

Krell's literature and web page state that the
FPB-300cx, FPB-400cx, and FPB-700cx share the SAME
circuit topology.

It's basically a question of how much power does the
power supply have to put into the same circuitry and
how many output devices share the load.

In that matter, the difference is only 1.25 dB.

The "quality" is really a function of how much of the amp's
capacity you are using. The smaller the fraction of the
amp's capacity - the more "linear" the response.

So you have to push a 300cx a little more than a 400cx to
deliver more power - and thus drive it more toward the
non-linear regime. However, you only push it 1.25 dB
more than the 400cx - so the difference will be marginal.

Dr. Gregory Greenman
Physicist

I currently own a pair of B&W Nautilus 801's and the fpb 300c amp. There is absolutely no need to for the 400 amp. You'd be wasting your money. The amp provides more than adequate power. Any louder your ears will start bleeding. believe me it's plenty.