In the Spirit of Compromise....

Rattlesnake Guy · 08-19-2009, 06:43 PM

This post is not for or against APS comment on not hearing a boat at a distance of 6 miles. After doing a bit of refresher on the non linear function of sound I have prepared a chart that shows the sound you would expect a boat that is just at the 82dB state level.

Although the decay of sound over distance is one that requires little debate as it is well known, the effect of reflections could be debatable. It comes down to what the concept of "not be able to hear" means. A boat at the current law of 82dB at a distance of 50 feet would be expected to be about 27 dB at 6 miles. About the sound of your refrigerator or a quiet computer fan.

08-19-2009, 06:43 PM	#11
Rattlesnake Guy Senior Member Join Date: Sep 2004 Posts: 1,254 Thanks: 423 Thanked 366 Times in 175 Posts	This post is not for or against APS comment on not hearing a boat at a distance of 6 miles. After doing a bit of refresher on the non linear function of sound I have prepared a chart that shows the sound you would expect a boat that is just at the 82dB state level. Although the decay of sound over distance is one that requires little debate as it is well known, the effect of reflections could be debatable. It comes down to what the concept of "not be able to hear" means. A boat at the current law of 82dB at a distance of 50 feet would be expected to be about 27 dB at 6 miles. About the sound of your refrigerator or a quiet computer fan. Attached Images

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OCDACTIVE (08-19-2009)