You would be surprised. We used to run two cabs that were about the size of the 12 Pi that had two 18" Widows in each cab. One cab was on the bass and one on the kick drum then EQ'd to just produce those nice low notes. It's not always about volume, but about the ability to produce the low end thump that makes the people in the front row want to pee. LOL!! We also played outdoors a lot in the summer time. If the soundman's doing his job it doesn't have to be ear splitting loud to get the job done.