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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. 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 ...

4. Popcorn ceiling - Wikipedia

   en.wikipedia.org/wiki/Popcorn_ceiling

   Popcorn ceiling texture. A popcorn ceiling, also known as a stipple ceiling or acoustic ceiling, is a ceiling with one of a variety of spray-on or paint-on treatments. [1] The bumpy surface is created by tiny particles of vermiculite or polystyrene, which gives the ceiling sound-deadening properties.

5. Linn Isobarik - Wikipedia

   en.wikipedia.org/wiki/Linn_Isobarik

   Linn also claimed "very low distortion" and "high sound pressure levels", without quantification. Recommended amplifier power rating is in the range of 50–500 watts. [ 4 ] [ 5 ] Hi-Fi for Pleasure noted that the speakers' impedance, although quoted at 3 ohms nominal, dipped considerably at some parts of the audio spectrum.

6. House passes rules package that will raise threshold for ...

   www.aol.com/house-passes-rules-package-raise...

   The rules package also included provisions to dissolve the congressional Diversity & Inclusion Office and rename the “House Committee on Oversight and Accountability” as “the Committee on ...

7. Noise, vibration, and harshness - Wikipedia

   en.wikipedia.org/wiki/Noise,_vibration,_and...

   Specific methods for improving NVH include the use of tuned mass dampers, subframes, balancing, modifying the stiffness or mass of structures, retuning exhausts and intakes, modifying the characteristics of elastomeric isolators, adding sound deadening or absorbing materials, and using active noise control. In some circumstances, substantial ...