Understanding and Managing Sound Exposure and Noise Pollution at Outdoor Events
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Technical Document AESTD1007.1.20-05 Understanding and managing sound exposure and noise pollution at outdoor events May 2020 Audio Engineering Society, Inc. 551 Fifth Avenue, Suite 1225 New York NY 10179 USA Tel: +1 212 661 2355. Email: [email protected]. Internet: http://www.aes.org The Audio Engineering Society’s Technical Council and its Technical Committees respond to the interests of the membership by providing technical information at an appropriate level via conferences, conventions, workshops, and publications. They work on developing tutorial information of practical use to the members and concentrate on tracking and re- porting the very latest advances in technology and applications. This activity is under the direction of the AES Technical Council and its Committees. 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Neither AES nor any of its Committees or members shall be responsible for any consequences resulting from the use of information contained in this publication. AES Technical Committee on Acoustics and Sound Reinforcement Technical Document Understanding And Managing Sound Exposure And Noise Pollution At Outdoor Events 2020‐05‐22 Prepared by the Working Group on Sound Exposure and Noise Pollution due to Outdoor Entertainment Events Chairman and Editor: Adam J. Hill, University of Derby, UK Contributors Chris Beale (SPLtrack, UK) Durand Begault (Charles M. Salter Associates, USA) Jon Burton (University of Derby, UK) Etienne Corteel (L‐Acoustics, France) Christian Frick (Rocket Science, Switzerland) Jim Griffiths (Vanguardia, UK) Marcel Kok (dBcontrol, Netherlands) Michael Lawrence (Rational Acoustics, USA) Bob McCarthy (Meyer Sound, USA) Johannes Mulder (Australian National University, Australia) Kees Neervoort (Event Acoustics, Netherlands) Elena Shabalina (d&b audiotechnik, Germany) Andy Wardle (University of the Highlands & Islands, UK) Table of Contents 1. Overview .........................................................................................................................................4 2. Audience experience.......................................................................................................................7 2.1. Perception and expectations ..................................................................................................7 2.2. Recreational sound exposure ...............................................................................................10 2.2.1. Measuring hearing damage ..........................................................................................10 2.2.2. Low‐frequency sound exposure....................................................................................11 2.2.3. Noise vs. music induced hearing loss............................................................................13 2.3. Level and measurement regulations ....................................................................................14 2.3.1. Measurement and monitoring procedures ..................................................................16 2.3.2. Preventative measures .................................................................................................17 2.3.3. Approach to sound exposure regulations.....................................................................18 3. System design ...............................................................................................................................19 3.1. Main PA.................................................................................................................................19 3.1.1. Center arrays.................................................................................................................20 3.1.2. Signal decorrelation ......................................................................................................20 3.1.3. Source‐oriented systems ..............................................................................................21 3.1.4. Design objectives ..........................................................................................................22 3.2. Subwoofer systems...............................................................................................................24 3.2.1. Ground‐based ...............................................................................................................24 3.2.2. Flown.............................................................................................................................26 3.2.3. Performance quantification..........................................................................................28 3.3. Additional sound sources and other considerations ............................................................29 3.4. PA shoot‐outs........................................................................................................................31 4. Noise regulations ..........................................................................................................................32 4.1. Motivation.............................................................................................................................32 4.2. World Health Organization ...................................................................................................33 4.3. North America.......................................................................................................................36 4.3.1. Canada ..........................................................................................................................36 4.3.2. Mexico...........................................................................................................................38 4.3.3. United States.................................................................................................................38 4.4. Central America ....................................................................................................................43 4.5. South America.......................................................................................................................44 4.6. Europe...................................................................................................................................45 4.7. Asia........................................................................................................................................50 4.8. Africa .....................................................................................................................................53 4.9. Australia and Oceania ...........................................................................................................54 4.10. Discussion..............................................................................................................................55 5. Noise prediction, measurement, monitoring + management......................................................57 5.1. Annoyance due to entertainment‐derived noise .................................................................57 5.1.1. Music‐derived noise......................................................................................................57 5.1.2. Time relationship ..........................................................................................................60 5.1.3. Small indoor venue noise..............................................................................................61 5.1.4. Factors unrelated to audio............................................................................................62 2 5.1.5. Prediction methods.......................................................................................................63 5.1.6. Inaudibility criteria ........................................................................................................64 5.1.7. Summary .......................................................................................................................65 5.2. Approach to noise regulations..............................................................................................65 5.3. Measurement regulations ....................................................................................................66