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1 <br />1 <br />I <br />Figure 8 <br />Typical Noise Levels of Familiar Sources <br />Physically Painful <br />Extremely Loud <br />Discomforting <br />Very Loud <br />Loud <br />Quiet <br />Threshold of Hearing <br />Endo Engineering <br />dBA <br />Sonic Boom <br />Jet Takeoff at 200' <br />Oxygen Torch <br />Discotheque <br />Motorcycle at 15' (Unmutiled) <br />Power Mower at 3' <br />Newspaper Press <br />Freight Train at 50' <br />Food Blender <br />Electric Mixer, Alarm Clock <br />Heavy Truck at 50' <br />Busy Street Traffic at 50' <br />Average Traffic at 100', Vacuum Cleaner at 10' <br />Electric Typewriter at 10' <br />Dishwasher at 10', Air Conditioning Unit at 15' <br />Normal Conversation at 5' <br />Typical Daytime Suburban Background <br />Refrigerator at 10' <br />Bird Calls <br />Library <br />Motion Picture Studio <br />Leaves Rustling <br />