aight, a while ago i bought a used older model of the Peavey TNT115. Its been good,but now i need a louder set up. the way i see it, i have two options: 1.) buy another combo amp,preferably 2x10, and patch them together for a bi-amp system. 2.) sell the amp i have now,and put that money toward a half stack or something around $600-$800 now heres the deal: i need a system loud enought o be heard in a school auditorium since my band is opening for ZOX which is playing at my school in march. also,the guitarist in my band just got a new $1700 amp head and hes getting some beast speakers soon,so i dont want to be drowned out by that. which option is better? also: as far as i know,i cant hook up a cab to my peavey tnt 115. but i just want someone to verify that i DEFINITELY cant since that would be the best thing that could happen. There is output on the amp called CROSSOVER but ive read in the manual its for a bi-amp system. so if anyone knows the answer to that,id appreciate it. thanks guys.