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Meyer Sound to test the Brown Note (shit yourself thread) in MythBustersThe "Brown Noise To Make U Shit Yourself" has been the most popular thread on the message board here over the last year and now it seems it has been put through the test.Meyer Sound products and personnel were central to a new episode of MythBusters, the popular weekly television show appearing on the Discovery Channel. The quirky series, produced by Australia’s Beyond Productions, combines hard science and wacky humor as its two hosts, seasoned special effects wizards and all-around gadgetry freaks Adam Savage and Jamie Hyneman, debunk or, occasionally, confirm various urban legends. Topics investigated by MythBusters have ranged from getting stuck on a flushing airplane toilet to removing bloodstains with Coca-Cola. During the show’s premiere season, MythBusters called on Meyer Sound Staff Scientist Dr. Roger Schwenke to confront the legend that a duck’s quack doesn’t echo. To debunk this myth, live duck quacks were recorded and analyzed in a meadow at a duck farm, in Meyer Sound’s anechoic chamber, and in a large, empty warehouse. The question turned out to be rather more complicated than one would think. The MythBusters team returned to Meyer Sound recently to again enlist Schwenke, along with a custom-modified battery of Meyer Sound equipment, to test a myth rather less suited to squeamish viewers: the so-called “Brown Note.” It was a scientific investigation into a decidedly delicate subject. The story of the Brown Note, also known as the “Disco Dump,” asserts the existence of a low frequency vibration which, when reproduced at sufficient volume, resonates with the depths of the human digestive tract to cause what medical personnel call “involuntary gastrointestinal motility.” Put in less technical terms, the Brown Note reputedly precipitates a loss of sphincter control, giving rise to immediate defecation. Different versions of the myth place the frequency between 5 and 20 Hz, and recent variations claim that the effect has been produced at loud rock concerts. The Meyer Sound team, under the direction of Schwenke and John Meyer, devised a special test and measurement system in order to test the theory at levels far beyond that experienced at any concert, and at far lower frequencies. Twelve 700-HP ultrahigh-power subwoofers had their input cards modified to allow deep subsonic frequencies, and their ports plugged to prevent a loss of efficiency at frequencies below their normal operating range. The modified cabinets were then stacked three high and faced inward in an open ring configuration. Test signals were generated by a SIM 3 audio analyzer, with software modified to produce tones down to 5 Hz. A precision B&K sound level analyzer fed by a model 4189 microphone and ZF 0023 attenuator measured levels. Perrin Meyer, Meyer Sound’s software R&D manager, generated computer models of the subwoofer stacks’ behavior and animations of the effect their output would have on a human-sized cylinder. The test sessions were conducted in a large parking lot at Golden Gate Fields racetrack, on the shores of San Francisco Bay. Savage stood in the middle of the subwoofer ring, where he experienced the effect of very low frequency sounds (down to 5 Hz) at extremely high levels (120 dB SPL with a 9 Hz sine wave, up to 153 dB peak with narrow-band noise), though the higher levels were possible only above 20Hz. Safety was a prime consideration: tests were limited to about five minutes in each frequency range, and industrial-grade hearing protection was used above 120 dB. Savage was wired to medical monitoring machinery and watched closely by paramedics during the tests, while additional protection for those working in close proximity to the subwoofer stack was provided by a box of extra-large Depends. “I had anticipated very pronounced physiological effects,” says Roger Schwenke, who supervised the investigation. “As predicted, Adam felt vibration in the chest, and experienced blurring of vision from vibration of the eyeballs. We also heard distinct modulation of his voice when he was speaking.” But could the Brown Note produce its infamously distasteful response at a loud rock concert? The answer to that question will be revealed when the episode airs during the show’s second season. MythBusters will air on the Discovery Channel on Wednesdays from 8-9PM (ET/PT) throughout the fall, beginning September 29. The MythBuster’s challenge offered a refreshing change of routine for Schwenke, whose PhD in acoustics from Penn State University garnered him a position on Meyer Sound’s R&D staff three years ago. Currently, Schwenke heads the SIM 3 development team. “It was pretty amazing to be there,” he recounts. “I was a good 20 feet away, but I was feeling the effects as well – though less so than Adam, certainly.” Clearly, this MythBusters episode represents the ultimate embodiment of the old adage stating “It’s a dirty job but somebody has to do it.”
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