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In Reply to: RE: I'm not quite clear what you're suggesting… posted by David Aiken on April 24, 2010 at 23:47:14
Picture this, a retangular box, say 18 inches tall, 36 inches wide, 24 inches deep. No drivers, but maybe different sized ports out the back (facing the seats). Wave inlet (open slot, from side to side) across front, on the bottom. Internal wave directed, then re-directed baffel walls and sound absorbing materials inside. Maybe a slot from side to side across the top, as well. Think something like a PA (concert)speaker but, without the drivers, a horn speaker enclosure, except the sound waves go in are re-directed and absorbed so that a 20 Hz wave (for example; but proably inaccurate) thinks it can propogate, because it thinks it can go that far, due to the baffling. A purely passive device. Hope this helps.
Follow Ups:
There are devices that work that way for absorption. One is the Helmholtz resonater which is really tuned to a single frequency, that being its weakness. It's a highly effective absorber with a very narrow bandwidth. You can extend the bandwidth but at the cost of having it absorb less.
I think what you need to do is to buy or borrow a copy of F. Alston Everest's "Master Handbook of Acoustics". It contains some good explanations of the theory behind various approaches to absorption, including some that work along the lines you're describing, and descriptions/instructions on how to build such devices. I think you'll probably find some useful information on what you're thinking of in there.
David Aiken
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