whenyournex2me
08-05-2011, 07:04 PM
Interesting.
http://www.popsci.com/science/article/2011-07/acoustic-diode-only-lets-sound-travel-one-way-opens-door-true-soundproofing
http://www.popsci.com/science/article/2011-07/acoustic-diode-only-lets-sound-travel-one-way-opens-door-true-soundproofing