My "rigs" are an Ampeg PF350 and an Eden WTDI pedal. The Ampeg is plenty enough power for small gigs and if i play anywhere bigger, there is a PA which they will want me to DI into anyway. If i put the Ampeg up on a combo stand pointed up towards my head, it functions as a great monitor for myself and i can send the DI signal to FOH. However, all the "pros" seem to have large bass stacks. Can someone explain to me why it's necessary to have a massively high wattage head and a huge bass cab? I'm not trying to troll or anything, i seriously would like to know what they are for.