What does RBL stand for?

MLA style: "RBL." Acronym Finder . 2013. AcronymFinder.com 22 May. 2013 <a href="http://www.acronymfinder.com/Rating-Background-Level-(Australia%2c-ambient-noise)-(RBL).html">http://www.acronymfinder.com/Rating-Background-Level-(Australia%2c-ambient-noise)-(RBL).html
Chicago style: Acronym Finder . S.v. "RBL." Retrieved May 22 2013 from <a href="http://www.acronymfinder.com/Rating-Background-Level-(Australia%2c-ambient-noise)-(RBL).html">http://www.acronymfinder.com/Rating-Background-Level-(Australia%2c-ambient-noise)-(RBL).html
APA style: RBL. (n.d.) Acronym Finder. (2013). Retrieved May 22 2013 from <a href="http://www.acronymfinder.com/Rating-Background-Level-(Australia%2c-ambient-noise)-(RBL).html">http://www.acronymfinder.com/Rating-Background-Level-(Australia%2c-ambient-noise)-(RBL).html

Rating Background Level (Australia, ambient noise)

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