what are some efficient and cheap ways to record your own cinematic 'booms'? By this I mean the typical Hollywood film trailer low end impacts with a little rumble that rocks the sub woofer but is just wide enough in frequency range that it can still be just about felt on domestic speakers.

on this topic, are there any similar effective ways to get a nice heavy whoosh.

In general, I guess I'm asking how the heck these high end sound libraries recorded them in the first place?

THANKS!