So I've seen the gamut on here from 4 10's to a single 12 or 15....I realize acoustics in an open air environment are different than in a car or pickup but can anyone comment on SPL?

I would imagine that smaller but more drivers are pushing more air & sound "tighter" musically whereas the single big dog hits "harder"....is that the case? I also realize free air vs sealed vs ported (tube/slot) all add another variable in frequency response.

....curious basshead here.