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DAKTRONICS MOUNDS VIEW HIGH SCHOOL EASE OVERLAY <br />201 Daktronics Drive PO Box 5128 Brookings, SD 57006-5128 <br />800-325-8766 605-692-0200 fax 605-697-4700 <br />www.daktronics.com email sales@daktronics.com <br />General Noise Standards <br />The following are noise guidelines set by the EPA for dB/duration. Music played at sporting venues should not be louder than <br />the standards set by the EPA. In general, music that is being played during pregame warmups and halftime events should not <br />exceed the levels at the corresponding duration shown below. <br /> <br />dB Noise Level EPA Noise Exposure Limit <br />70 dB 24 hours <br />79 dB 3 hours <br />82 dB 90 minutes <br />85 dB 45 minutes <br />88 dB 23 minutes <br />91 dB 11 minutes <br />97 dB 3 minutes <br />102 dB 53 seconds <br />107 dB 16.7 seconds <br />117 dB 1.7 seconds <br /> <br />Additionally, below are examples of average decibel levels and common corresponding sounds: <br /> <br />Decibel Example <br />0 dB Threshold of Hearing <br />10 dB Normal Breathing <br />20 dB Background in TV studio <br />30 dB Quiet bedroom at night <br />40 dB Quiet Library <br />50 dB Average Home <br />60 dB Normal Conversation @ 3ft <br />70 dB Vacuum cleaner @ 3ft <br />80 dB Heavy Traffic @ 16ft <br />90 dB Diesel Truck @ 32ft <br />100 dB Night Club @3ft from speaker <br />110 dB Chainsaw @ 3ft <br />120 dB Threshold of discomfort <br />130 dB Threshold of pain <br />140 dB Jet Engine @100ft <br /> <br />List of Illustrations <br />Figure1 – EASE Acoustical Overlay <br /> This shows the sound levels that the sound system will produce over a large area. Decibel levels are <br />shown on the overlay with white text and an arrow pointing to the location t he sample level was taken from the <br />model. To get an idea of the loudness at each location, compare to the values in the table above. <br /> <br />Figure2 – Coverage Cone Overlay <br /> This shows the approximate angles of the two rotatable speaker sections inside the speaker cabinet as <br />modeled. These angles are approximate and can be angled in 5 degree increments during install to adjust to the <br />best angle for the facility.