Quick 'n dirty sub simulation?

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I'm looking for some kind of basic, simple, and ideally free subwoofer simulator. The purpose is just to make some rough curves of various woofers in a wall stud for a project
http://www.diyaudio.com/forums/subwoofers/204001-studly-subwoofers.html
Something like LEAP is way more accurate, but I don't need that at this moment and don't have a current key.

Criteria:
1) Response curves IN ABSOLUTE dB!
That is, not the curve going up to 0 dB, that is not helpful for comparing sensitivities (ja, I could calculate sensitivity and scale but notice the "quick" in the title)

2) Could be on-line, or could be downloadable Excel spreadsheet.

3) ????

Thanks!
 
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