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Avatar Consultants, Inc: Definition of Intensity
Power, loudness, and decibel levels of sound waves are described and explained. The relative power output of various musical instruments is given.
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Mc Squared: Church Acoustics and Sound Systems
A series of pages written by a sound system design group; the pages provide excellent background information about acoustical topics related to the design and analysis of both sound systems and rooms. Contains a lot of good physics in an...