"The Wall of Sound is the name some people gave to a super powerful, extremely accurate PA system that I designed and supervised the building of in 1973 for the Grateful Dead. It was a massive wall of speaker arrays set behind the musicians, which they themselves controlled without a front of house mixer. It did not need any delay towers to reach a distance of half a mile from the stage without degradation. Stanley, Owsley (April 5, 2006). Description of the Wall of Sound, lowcarber.org. Retrieved December 31, 2011.
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