I have been a Krell fan and owner for 20 years, they make great sounding gear. That said, Fpb was slightly withdrawn in the treble with an emphasis on the deepest bass, overshadowing the middle bass. The treble got better in Fpb c and cx but the mid bass articulation/speed did not improve until the Evolution series, a lot of the current gear is Evo in new casing. Krell' bigest problem has always been heat, they run very hot ! My big Fpb700 Cx has had all capacitors changed and had 2 burned out transistors. My Kps 25sc
has had all capacitors changed, 2 burned out laser heads and 3 out of 4 BurBrown pcm1704 k dac chips killed by heat ! My brother has the same machine and his older 20bit dac board is impossible to repair, his capacitors have also been replaced. The lasers where hard to get for a while until The Chinese started making copies, the dac chipsets are almost all gone. I wish my Kps 25sc had electric fans like the new Krell gear, the inclusion of fans in the new gear will make buyers and service department at Krell much happier!