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Lots of people can actually hear down as low as 20Hz, the lowest note on a bass guitar (open E) is 42 Hz. Just it takes an awful lot of power or a really big speaker to get sound that low to be loud enough to hear over road noise. A 20Hz wave has a wavelength of 56.5 feet, which means you'd need a whole lot of speaker, a really big horn, or a powerful amp and electronic control to give it more boost at lower frequencies. Before there was effective electronic control and computer-aided speaker design, to get into the 40Hz range you had to have a 12" or bigger speaker, to get 20 Hz you needed 18". They also used to use bigger speaker enclosures because amplifier technology hadn't caught up with the size of amphitheaters--bigger speakers make noise more efficiently. In an AW11, the only place you could put an 18 is in the frunk--you didn't need that spare tire, did you?
Nowadays there are subwoofers that will hit 40Hz using a 4" driver--for computer and home theater systems. One of those subs in the frunk would probably sound ok, unless you had anything loose in there.
Best of both worlds is a powered low-profile subwoofer like the Boss Bass mentioned above. 20Hz is totally plausible using modern electronics and a 10" speaker, and it should fit under the passenger seat so you don't have to modify your car from stock. If that's not enough bass, just use two of them.
I'm 6'2" and I don't have trouble with my head hitting the roof unless the seat is leaned forward.
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