EXPLAINS THE FOLLOWING: VELOCITY OF SOUND REFRACTION, RANGE OF HEARING, LOWERING INTENSITY; ATTENUATION IN AIR, ELIMINATING HIGH & LOW FREQUENCIES, REVERBERATION & FOCUSING OF SOUND.

We digitized and uploaded this film from the Prelinger Archive. Email us at footage@avgeeks.com if you have questions about the footage and are interested in using it in your project. Buy this film on DVD.

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