I want to start gigging but I am not sure how many watts I need cuz Ive plugged into 350 watt Ampeg and Yorkville heads and they don't seem very loud. Why not? And explain what the ohms mean as far as ext. cabs and just watts in general. Do I need some 2000 watt GK monster? Or will a 350 watt solid state do the job well? Thanks!