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Follow-up [message #17731 is a reply to message #17684] Wed, 13 April 2005 09:01 Go to previous messageGo to previous message
JLapaire is currently offline  JLapaire
Messages: 156
Registered: May 2009
Master
It took 8 or 10 tries to get dialed in, but I finally got the suckers nailed. Picture a 5" square piece of plywood with a 1.5" hole in the middle, then a 1" slice of 4" PVC pipe, then another piece of ply with hole. Exhaust hose runs in one side, another comes out the other side - with a 44dB drop at the target frequency! Magic. One minute you've got an annoying high pitch scream, the next minute there's just a quiet Woosh of air.

Now to come up with a shop-ready version that looks decent, then make 44 of them.

Thanks Wayne, that article provided a good launch.

John

 
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