If you wish for good bass, smooth highs and a rich midrange, try KT77s. I auditioned the Cronus Magnum 3 at home with the stock KT120 and found them a bit clinical also. So I ordered the amp with Gold Lion KT77s installed from Rogue. If you choose KT77s you’ll need to reduce the bias from 35 to 30 as per Rogue.
Kt120 Vs kt90 Sound characteristics
Have the kt90's and would someone clue me in on sound differences on the 120's not power isnt important