Hello there, I tried this head today, with my TRB6II and an Ampeg Classic HLF 4ohm cabinet. It definitely sounds underpowered to me. It was like if those 300W@4ohm were so weak! Even at 3/4 of its master and half volume.. I'm disappointed cause I like its preamp section, but its power amp doesn't seem to supply those 300W. I tried a GK400 RB IV last week, and its 180W@8ohm are so much louder according to me. Anyone having experience with this head?