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Soundproofing
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{{Short description|Methods to reduce sound pressure}} {{cleanup|reason=There are too many short sections|date=December 2023}} [[File:Consumer Reports - product testing - headphones in anechoic chamber.tif|upright=1.35|thumb|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 barrier]]s to reflect or absorb the energy of the [[sound waves]], using damping structures such as [[sound baffle]]s for [[Absorption (acoustics)|absorption]], or using active [[anti-noise]] sound generators.<ref>{{Cite thesis |last=Hawkins |first=Timothy Gerard |title=Studies and research regarding sound reduction materials with the purpose of reducing sound |date=2014 |degree=PhD |publisher=California Polytechnic State University |doi=10.15368/THESES.2014.121 |s2cid=13922503 |doi-access=free }}</ref><ref>{{Cite journal|date=July 1924|title=Acoustics of Buildings: including Acoustics of Auditoriums and Sound-proofing of Rooms|url=http://www.nature.com/articles/114085b0|journal=Nature|language=en|volume=114|issue=2855|pages=85|doi=10.1038/114085b0|bibcode=1924Natur.114R..85.|issn=0028-0836|hdl=2027/mdp.39015031200952|s2cid=46370464|hdl-access=free}}</ref> [[Acoustic quieting]] and [[noise control]] can be used to limit unwanted noise. Soundproofing can reduce the transmission of unwanted direct sound waves from the source to an involuntary listener through the use of distance and intervening objects in the sound path (see [[sound transmission class]] and [[sound reduction index]]). Soundproofing can suppress unwanted indirect [[sound waves]] such as [[Reflection (physics)|reflections]] that cause [[Echo (phenomenon)|echoes]] and [[resonance]]s that cause [[reverberation]].
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