Koss (P77500) Headphones Headphones

Koss (P77500) Headphones Headphones 


An ideal addition to classes on vibrations and waves, Noise Reduction Headphones are a simple-to-use device with a number of applications. They're a perfect way to demonstrate Active Noise Control in action and introduce discussions on waves, acoustics, superposition, and interface. This revolutionary Active Noise Reduction (ANR) stereo phone system reduces harmful and annoying low frequency sounds in noisy environments. Microphones in the headset "listen" to noise coming to your ears. Then a microchip creates a mirror image wave (of the same frequency and amplitude as the original, but 180 degrees out of phase), and sends it to the headphones. Result: Destructive interference cancels the noise.

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