He's simply wondering what effect enclosure size has on sound.
Here's a better way of phrasing his question :
If all variables are the same (Amp, sub, vehicle, etc) and the only thing that changes is the volume of the enclosure, what effect does this have on the sound?
He's looking for something along the lines of "smaller sealed enclosures have a more balanced output but less volume, but larger sealed enclosures have a steeper drop off blah blah blah" btw that was just an example and in no way correct or based on anything //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif