Subwoofers and cab airspace?

A single cab truck would not have as good of lows as a 4 door right? Why does subs sound better outside the vehicle with a 4 door vs a single cab. When I hear ppl go by it usually sounds better the bigger the cab on their truck. Can somebody explain how subs sound in different cabs like single extended and supercrew cabs. I got two sq hds310's in big 35hz box on 2k @ .5 and inside the cab it sounds great and outside the cab its hard to hear it unless you are inside. Where as when I hear ppl go by with a 4 door they could have kicker or qpowers and outside the truck it sounds great but inside the truck it's not very loud.

I'm wondering how are my the sound of my subs gunna change coming out of my single cab dodge and into a 4 door ford. With a lot more cabin space will it give them a cleaner better sound or need more power with more cab space

Just explain how a certain pair of subs will sound in different sized cabs or interiors. Single cab vs a 4 door supercrew cab

Subwoofers, especially the big ones, move a lot of air. In a small enclosed space that is fairly airtight, that movement of air is restricted, stifling the movement of the speaker cone and attenuating (reducing) the volume. Smaller subs usually perform better in a small cab than larger ones. Outdoors, a speaker cone can move freely without this interference, , but there's little reflection of sound that can reinforce the volume of a speaker since there aren't any (or many) surrounding surfaces in close proximity. Outside you are also more likely to be further from the speakers. If you double your distance you halve the apparent loudness, and of course the movement of air by the wind alters sound pressure waves and loudness. What will happen when you move your speakers to another vehicle? There's no doubt they will be more responsive. They will probably sound different with a larger volume of air in the cab, not to mention placement of the speakers and different reflective or absorptive surfaces inside the vehicle. The number of occupants even effects the sound.

The 'wave-length' of a low bass signal is something like 25 to 35 feet - so you need a good long path for them to develop and resonate correctly.

There's a lot you will miss when the speakers play into the furniture instead of at the open area. Your cockpit space can be filled with the sound without need for such high pressure volume. It's like the difference between a band playing 50 w amps in a small barroom vs the same band playing on a football field. On the field you strain the hear them, but in the club they give you a headache. I think the difference you hear is bad applications versus better ones. If you don't have room for adequate cabinets, the efficiency of the speaker will be reduced.