hey, just bought a 150w combo amp, and i love it. perfect, love the tone, no problems after 2 weeks.

but i looked on the back of the amp, and saw to ports. 8 ohm extension left and right ports. so i got to thinking, are these for expanding to a stack? i think it would be wicked to have a combo ontop of a cab, so 470 watts. haha. can anyone answer my quesion? thank you.