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2. Soundproofing - Wikipedia

   en.wikipedia.org/wiki/Soundproofing

   Soundproof drywall in combination with a viscoelastic compound may achieve a noise reduction of STC 60+. Walls are filled with mineral wool insulation. Depending on the desired level of treatment, two layers of insulation may be required. Outlets, light switches, and electrical boxes are weak points in any given soundproofing treatment.

3. Acoustic foam - Wikipedia

   en.wikipedia.org/wiki/Acoustic_foam

   A close-up image of acoustic foam.. Acoustic foam is an open celled foam used for acoustic treatment.It attenuates airborne sound waves, reducing their amplitude, for the purposes of noise reduction or noise control. [1]

4. Sound transmission class - Wikipedia

   en.wikipedia.org/wiki/Sound_transmission_class

   Installing absorptive insulation, for example fiberglass batts and blow-in cellulose, into the wall or ceiling cavities does increase the sound transmission class significantly. [14] The presence of insulation in single 2x4 wood stud framing spaced 16 inches (410 mm) on-center results in only a few STC points.

5. Sound attenuator - Wikipedia

   en.wikipedia.org/wiki/Sound_attenuator

   A sound attenuator, or duct silencer, sound trap, or muffler, is a noise control acoustical treatment of Heating Ventilating and Air-Conditioning (HVAC) ductwork designed to reduce transmission of noise through the ductwork, either from equipment into occupied spaces in a building, or between occupied spaces.

6. Acoustic plaster - Wikipedia

   en.wikipedia.org/wiki/Acoustic_plaster

   Most acoustic plasters have a Noise Reduction Coefficient between 0.5 and 1.00. [3] The Noise Reduction Coefficient (NRC) determines the ability of a material to reflect or absorb sound. [5] It is a number between 0 and 1, which 0 being perfectly reflective and 1 being perfectly absorptive. [5]

7. Best noise-canceling headphones, according to Consumer Reports

   www.aol.com/news/best-noise-canceling-headphones...

   Best Overall Sennheiser PXC 550-II. The Sennheiser PXC 550-II is one of the highest-scoring headphones in our ratings, with superb sound quality and noise canceling. The PXC 550-II is as much as ...