For a good public address system the sound intensity at the farthest point should be at least-A-20 dB over threshold of hearingB-40 dB over threshold of hearingC-80 dB over threshold of hearingD-120 dB over threshold of hearing-C-80 dB over threshold of hearing

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C 80 dB over threshold of hearing Noise that is 100 db at one meter will have an intensity of only 1/100 as much at ten meters. That&#39;s 2 bels, or 20 decibels less, since a bel corresponds to a factor of ten. So at 10 meters the sound is 80 db. At 100m the intensity is down to 60 db.

Communication Systems

For a good public address system the sound intensity at the farthest point should be at least

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Communication Systems

For a good public address system the sound intensity at the farthest point should be at least

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