I believe the changes to the FPB amps do not actually involve more ouput power. The amps are so conservatively rated that Krell can easily label the new models with a higher number. The improvements to the amps are in some new CAST circuitry and a new Sustained plateau Biasing scheme. This is the info i have come across, mebbe someone from Krell would like to chime in and clarify it further for us.
