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I was wondering how would you calculate airspace etc with these kind of encolsures? It seems as if they just make a enclosure and slap in two subs, without considering how much sealed airspace they need etc.

 
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we often do, really.

you can get a general estimate using sand or styrofoam popcorn. or water. or anything, really, that comes in small pieces that you can pack with reasonably regular density.

 
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Wouldnt the subs sound like crap though? I dont think they made any kind of volume measuerment in the DIY. I wonder who that setup sounds.

 
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if its to be a sealed enclosure you generally have lots of varriance in air space, and pretty much any sub will sound decent on a sealed enclosure even if its a little to big or a little to small

 
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yep. if you arent gonna compete SQ, youve got LTOS of leeway. and even if you are competing SQ, usually its got such a small voice that its not a big issue.

now, if you are looking to get 100% output from the driver, regardless of quality of sound, then your volumes will have to be more closely regulated! but for daily driving or building a stealth system, or a show system, airspaces can "give" a little for aesthetics or function, etc.