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    Recreation > Audio > Do-It-Yourself > Loudspeakers  (21)

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	Acoustics.org - http://www.acoustics.org/ Provides easy access to information in the broad field of acoustics. Provided by the Acoustical Society of America.
	Sound Sucker: Acoustic Illusion - http://www.amasci.com/freenrg/audhole.html William Beaty describes an acoustic project with weird results.
	Art Ludwig's Sound Page - http://www.silcom.com/~aludwig/contents.htm Contains large amount of information about physical and room acoustics, design of loudspeakers.
	C37 Acoustics Dieter Ennemoser - http://www.ennemoser.com Violinmaker and aoustic researcher D.Ennemoser's C37-theory of natural sound, including applications on violins and loudpeakers.
	Scientific Applications and Research Associated, Inc - http://www.sara.com/ SARA specializes in harnessing electromagnetism, plasmas, acoustics and electronics to build practical applications for force protection, renewable energy, UAVs, small robotics and special test challenges.

	Online Structural Engineering Software - http://www.soft4structures.com/products.html Theoretical models for plates, beams, trusses and shock absorbers.
	Leak Detection Methods for Plastic Water Distribution Pipes - http://irc.nrc-cnrc.gc.ca/ui/bu/leakdetect_e.html Research project at the Institute for Research in Construction to investigate the effectiveness of acoustic leak detection equipment.
	Prediction of Earthquakes - http://www.deci.com/poe.htm Paper by H.L.Dunegan on the use of high frequency sensors to detect acoustic emissions in order to predict earthquakes.
	Sonic Architecture (TM) - http://www.sonicarchitecture.com Bill and Mary Buchen.
	The Sonic Weapon of Vladimir Gavreau - http://www.borderlands.com/archives/arch/gavreaus.htm Gerry Vasilitos describes how Dr. Gavreau and his staff periodically experienced an extreme nausea. Further research led them to identify low frequency sound (7 Hz) as the cause. Could this be used as a weapon?

	Modal Analysis and Structural Fatigue - http://www.modalanalysis.com Solutions using computer modelling to determine the vibration modes and impact on a building, equipment or mechanical component when exposed to a vibration source.
	http://physics.nad.ru/Physics/English/waves.htm - http://physics.nad.ru/Physics/English/waves.htm Provides computer animations of waves.
	Wave Field Synthesis and Holophony - http://www.syntheticwave.de/ Provides information with animations on a wave field synthesis based holophony approach to reproducing the acoustics of the opera house in the living room.
	PureSpeakers - http://www.purespeakers.com Discussions of loudspeaker plans and designs. Sealed, isobaric, ported, mtm, speaker, esotar, tweeter, woofer, midrange, speaker building
	In-Flight Rotorcraft Acoustics Program (IRAP) - http://halfdome.arc.nasa.gov/research/IRAP-intro.html NASA's aeronautics research will reduce noise to make helicopters and tiltrotors more acceptable to the public. The objective of IRAP is to acquire rotorcraft noise data in flight for comparison to wind tunnel data.

	Acoustical Porous Material Recipes - http://apmr.matelys.com Glossary of terms, models and research methods.
	Acoustics and Vibration Animations - http://www.kettering.edu/~drussell/demos.html Contains animations which visualize certain concepts concerning acoustics and vibration.

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