Hey there, I am mainly a lighting technician, but recently i've gotten into working with my friend who DJs. I was wondering if anyone knew if there was a rule on how many watts or the size speakers that are necessary to produce a certain kind of effect for evert 10' or 20', whatever. Specifically, I am working in a rom 60' x 80' with a triangular roof at the peak is 30' and the walls are 20'. Most importantly, the walls are made of aluminum or tin sheets (the stuff you would use as a sound effect for thunder), so I know there will be major reverberation. Any suggestions would be really helpful. Thanks!