let me chime in add kudos for krell
over the years i have had excellent and then terrible experiences with krell amps and integrateds... recently, very good experiences again
as a general rule i think the ’ksa’ series, fpb, evo of class a/ab amps are excellent
if good sound (as well as awesome power) is the priority, i would steer clear of any ’kav’ series (there are many of them)... they sound hard and strident (maybe fine for sizzle boom home theater but not for natural 2 channel imo)
since the s series (s-300i s-550i) to the newer ’k’ series, i think the best of krell is back and these are absolutely in the same class as other top players in this class - nuanced sound, delicacy with power, natural timbres, a touch of warmth, ultra refined treble, excellent spatial re-creation...
among these, the s series are the best buys of the bunch, they were excellent designs but assembled in china, so some will poo-poo that (100% their loss if they feel this way) -- i picked up an s-550i locally and it is simply superb and a wonderful value in the used market... tremendously satisfying, simply lovely with my big maggies...