Editing Brown note (section)

== Testing by Mythbusters ==
In February 2005 the television show ''[[MythBusters]]'' attempted to verify whether the "brown note" was a reality. 

They used twelve [[Meyer Sound]] 700-HP [[subwoofer]]s—a model and quantity that has been employed for major [[Rock music|rock]] concerts.<ref>{{cite web |url=http://www.discovery.com/tv-shows/mythbusters/mythbusters-database/brown-note/ |title=Brown Note &#124; MythBusters |publisher=Discovery |date=2012-04-11 |access-date=2016-05-29 |archive-date=2016-05-11 |archive-url=https://web.archive.org/web/20160511130630/http://www.discovery.com/tv-shows/mythbusters/mythbusters-database/brown-note/ |url-status=live }}</ref><ref>{{cite web| url=http://www.meyersound.com.au/brownnote.shtm| title=Brown Note| publisher=Meyer Sound| year=2000| access-date=2006-08-30| url-status=dead| archive-url=https://web.archive.org/web/20060906094120/http://www.meyersound.com.au/brownnote.shtm| archive-date=2006-09-06}}</ref> Normal operating frequency range of the selected subwoofer model was 28&nbsp;Hz to 150&nbsp;Hz<ref>{{Cite web |url=http://www.meyersound.com/pdf/products/concert_series/700-hp_ds.pdf# |title=Meyer Sound 700-HP UltraHigh-Power Subwoofer datasheet |access-date=2007-11-14 |archive-url=https://web.archive.org/web/20071021075207/http://www.meyersound.com/pdf/products/concert_series/700-hp_ds.pdf# |archive-date=2007-10-21 |url-status=dead }}</ref> but the 12 enclosures at ''MythBusters'' had been specially modified for deeper bass extension.<ref name=Meyer2004>{{cite web|url=http://meyersound.com/news/2004/brown_note/index.php|title=Meyer Sound Gets Down to Basics in MythBusters Episode|date=September 2004|publisher=Meyer Sound Laboratories|access-date=September 1, 2010|archive-url=https://web.archive.org/web/20110714081338/http://meyersound.com/news/2004/brown_note/index.php#|archive-date=2011-07-14|url-status=dead}}</ref> Roger Schwenke and John Meyer directed the Meyer Sound team in devising a special test rig that would produce very high sound levels at infrasonic frequencies. The subwoofers' [[Bass reflex|tuning ports]] were blocked and their input cards were altered. The modified cabinets were positioned in an open ring configuration, in four stacks, with each stack containing three subwoofers. Test signals were generated by a SIM 3 audio analyzer, with its software modified to produce infrasonic tones. A [[Brüel & Kjær]] sound level analyzer, fed with an attenuated signal from a model 4189 [[Microphone#Measurement microphones|measurement microphone]], displayed and recorded sound pressure levels.<ref name=Meyer2004/> 

The hosts on the show tried a series of frequencies as low as 5&nbsp;Hz, attaining a level of 120&nbsp;[[decibel]]s of [[sound pressure]] at 9&nbsp;Hz and up to 153&nbsp;dB at frequencies above 20&nbsp;Hz, but the rumored physiological effects did not materialize.<ref name=Meyer2004/> The test subjects all reported some physical anxiety and shortness of breath, even a small amount of nausea, but this was dismissed by the hosts, noting that sound at that frequency and intensity moves air rapidly in and out of one's [[lung]]s.  The show declared the brown note myth "busted".