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2. Acoustic quieting - Wikipedia

   en.wikipedia.org/wiki/Acoustic_quieting

   Sound reflections: by limiting the reflection using many methods, e.g. by using acoustic absorption (deadening) materials, trapping the sound, opening a "window" to let sound out, etc. By analyzing the entire sequence of events, from the source to the observer, an acoustic engineer can provide many ways to quieten the machine.

3. Noise control - Wikipedia

   en.wikipedia.org/wiki/Noise_control

   Pathway alterations include physical materials, such as foam, absorb sound and walls to provide a sound barrier that modifies existing systems that decrease hazardous noise. Sound dampening enclosures for loud equipment and isolation chambers from which workers can remotely control equipment can also be designed.

4. Soundproofing - Wikipedia

   en.wikipedia.org/wiki/Soundproofing

   A pair of headphones being tested inside an anechoic chamber for soundproofing. Soundproofing is any means of impeding sound propagation.There are several methods employed including increasing the distance between the source and receiver, decoupling, using noise barriers to reflect or absorb the energy of the sound waves, using damping structures such as sound baffles for absorption, or using ...

5. Sound transmission class - Wikipedia

   en.wikipedia.org/wiki/Sound_transmission_class

   Though the terms sound absorption and damping are often interchangeable when discussing room acoustics, acousticians define these as two distinct properties of sound-isolating walls. Several gypsum manufacturers offer specialty products which use constrained layer damping , which is a form of viscous damping .

6. Anechoic chamber - Wikipedia

   en.wikipedia.org/wiki/Anechoic_chamber

   Minimization of the reflection of sound waves by an anechoic chamber's walls Testing headphones in the Consumer Reports anechoic chamber. The requirement for what was subsequently called an anechoic chamber originated to allow testing of loudspeakers that generated such intense sound levels that they could not be tested outdoors in inhabited areas.

7. A sculpture shown at LACMA ended up on Craigslist. A DJ ... - AOL

   www.aol.com/news/sculpture-shown-lacma-ended...

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