What can you do with an 18 that you can't do with a lesser diameter driver? I've thought about a combo 18 and 2x10 in roughly a 32"-36" (~ 6x10) height. I'm not thinking of a sub so much as just finding out the tonal differences of an 18. Any good styles of cabinets for an 18? Maybe a short throw like those Schroeder cabs? Ideas?