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<br />Tile III'.~erse S(III;]re L.;],,~ l)r~)I)lelll <br /> <br />In an open area., sound drops off according to the inverse square law. In an auditorium where <br />the front seats are 6 meters (20 ft.) from the sound s OUfc e and the back seats are 60 m (200 ft.) <br />from the sound s OUfc e, the sound intensity would drop by a factor of 100 ( = 20 de cib els ) <br />b etwe en the front seats and the back seats if it followe d this p attem. This is an unac c eptable <br />10 s s which is prevente d partially by reverb eration. <br /> <br /> <br />At 111 times the <br />di~>tanCEl, U, a ~];ame <br />sound en~rgv will <br />be spra.a:::j oO","'er <br />1 Ol1 times the a~e~. <br />a droOp to 1/100 <br />the intensi~{r <br /> <br />--------- <br /> <br />~~~~~~~~._----- <br />---~ <br />-- -.. . --- <br /> <br />8m - <br /> <br />-------- <br />By the rule of thumb tor <br />loudness, a 2MB drop wau Id <br />meall 114 as lou.J at (.0:11! <br /> <br /> <br />60nl <br /> <br />Source: Georgia State Univ. Web Site <br />