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Sound mirrors |
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service dept Steve 
Old Croc 
Joined: 30 January 2010 Location: S.W.London Status: Offline Points: 2050 |
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 Topic: Sound mirrorsPosted: 02 June 2011 at 8:57am |
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Anyone who says they know about acoustics should have a look at this tech.
http://www.spiegel.de/international/zeitgeist/0,1518,765771,00.html |
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Nachural
Young Croc 
Joined: 15 April 2009 Location: West Midlands Status: Offline Points: 1259 |
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Posted: 02 June 2011 at 11:50am |
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Saw a documentary recently about these. They set up a B&K mic in front of them to measure the gain they provided and flew a WWII plane towards it. Detected engine noise at 22Km. Check out this, the Meyer sound beam – http://www.meyersound.com/products/industrialseries/sb-1/ |
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it's all just cardboard and magnets really
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