Might as well go for the kill....
You mentioned millionaire land...
http://www.hometheatershack.com/forums/attachments/diy-subwoofers-general-discussion/18967d1265033487-maelstrom-x-21-tapped-horn-384-cubic-feet-5hz-35hz-concrete1-copy.jpg
http://www.hometheatershack.com/forums/diy-subwoofers-general-discussion/25142-maelstrom-x-21-tapped-horn-384-cubic-feet-5hz-35hz.html
And if you wanted to try a bit of design tweaking before committing to concrete:
http://www.blogcdn.com/www.engadget.com/media/2007/02/2-13-07-snow_horn.jpg
Yes, I did waste a few years of my life trying to mentally design a brown note delivery mechanism...
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Might as well go for the kill....
You mentioned millionaire land...
http://www.hometheatershack.com/forums/attachments/diy-subwoofers-general-discussion/18967d1265033487-maelstrom-x-21-tapped-horn-384-cubic-feet-5hz-35hz-concrete1-copy.jpg
http://www.hometheatershack.com/forums/diy-subwoofers-general-discussion/25142-maelstrom-x-21-tapped-horn-384-cubic-feet-5hz-35hz.html
And if you wanted to try a bit of design tweaking before committing to concrete:
http://www.blogcdn.com/www.engadget.com/media/2007/02/2-13-07-snow_horn.jpg
Yes, I did waste a few years of my life trying to mentally design a brown note delivery mechanism...