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In my experience, you can get the bottom octave (20-40Hz) in a car without too much effort; since a car is a sealed "room". I used two 6x9 Boston Acoustics woofers that I added about an ounce of epoxy to the cones and mounted them on 1/2" CDX plywood. Using the old Stereophile CD test tones and a Radio Shack SPL meter, I had nearly flat extension down to 20Hz.
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