Thoughts on Krell FPB series? 600 in particular.

There's more to it than just extra power. How does the system sound when going from your 850 directly to the amp?

The Fpb 600 is an awsome amp, the cx has more sparkle on the top and the cx has an uncanny realisim to the mid-range, and more clear than the original fpb amps, neither less, both models are very fine amps that will give you what you seek for the thiels that need the power to drive them to their top performance that they can possibly do.cheers.

I would go with 400CX over the 600. 700CX would be even better, but $$$.

There is a big improvement when going from 300 to 400CX.

I had theClasse CA400 and once I got a krell fpb 600 ...well I sold the classe as its bass does not even come close and the headroom is amazing.
I have the fully recapped one for sale here as I own 2 and only need one.
The early models should be getting to the recap age as there original caps are not as good as the newer ones.
The cx is a subtle difference for thousands of dollars.
Good luck

I am a big fan of my FPB 300cx amp. Unkless you have a very demanding speaker load, I cannot imagine this amp not giving you all the slam and high end sparkle you need or want. Plus, it is bulletproof. Mine is almost 11 years old and never had even a hiccup.

Neal