Re: size of vehicle and spl
A main factor that you guys seem to be leaving out is the design of the car. Hatchbacks are prime for SPL due to the gain they get due ot the desing of hte cabin. CRX's are sweet for SPL for that exact reason. In the explorer vs suburban example audioholics air compression comes into play. So to answer your quesiton, yes the vehicle makes a huge difference, along with deadening, box, box placement, power, and driver.
Alpine CDA-7995, A/D/S 3 Series Comps, ED 8A, SoundStream Reference 604, 98 Civic Sedan