#1
I'm thinking of buying a cabinet for my Hughes & Kettner Matrix 100watts combo. I play in a band and i play mostly metal. Is it useful/possible???
#2
It'll push more air, and be a bit louder, but not too much. The combo should really be enough anyway.

What's the problem you've got with your combo though?
"Breathe, breathe in the air
Don't be afraid to care"

Fender Strat/Tokai LS80>few pedals>Orange Rocker 30
#4
But does it sound good enough?
You could mess around with the EQ settings a bit, that might help you, or you can get an EQ pedal too, to make everything sound how you want it.
"Breathe, breathe in the air
Don't be afraid to care"

Fender Strat/Tokai LS80>few pedals>Orange Rocker 30