Directed Sound

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And now, speakers made of cardboard. There's an article dated 14 July 2004 here: http://www.msnbc.msn.com/id/5404920/ about some new portable flat-pack speakers made of cardboard. Here's an excerpt from the article:
"But the people at Sonic Impact Technologies have. Using something called NXT flat panel technology the SI people have designed low-cost cardboard speakers that actually sound pretty good.
The SoundpaX speakers come in a very flat package; unfolded, the speakers are tall and pyramid-shaped, 13.5 inches high and 12 inches deep. They weigh next to nothing. Don’t forget, it’s just cardboard.
On the inside of the front surface is the device that makes cardboard into speakers; the Soundpad. It’s a small, white plastic device which vibrates and makes anything attached to it vibrate. The British company NXT explains the material, its shape and the vibrating motor used in their Soundpad are governed by some very complex rules of physics!
If you don’t like the way it looks or you’re allergic to cardboard, SI sells Soundpads separately for $24.95 a pair. You can stick them on anything (posters, thin tables, bookcases, door panels and ceiling tiles) and see how well they do as speakers. Don’t forget you’ll still have to do something with the wires from your new speakers to the amplifier."
Wonders will never cease.