Permissible Exposure Time Guidelines − Sound Pressure Level - SPL - AVS Forum
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post #1 of 17 Old 07-11-2012, 10:31 AM - Thread Starter
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Sound Pressure Level - Permissible Exposure Time

115 dB - 0.46875 minutes (~30 sec)
112 dB - 0.9375 minutes (~1 min)
109 dB - 1.875 minutes (< 2 min)
106 dB - 3.75 minutes (< 4 min)
103 dB - 7.5 minutes
100 dB - 15 minutes
97 dB - 30 minutes
94 dB - 1 hour
91 dB - 2 hours
88 dB - 4 hours
85 dB - 8 hours
82 dB - 16 hours

http://www.sengpielaudio.com/TableOfSoundPressureLevels.htm

Wonder how true it is and whether it changes anyone's perspective regarding SPL at all costs?
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post #2 of 17 Old 07-11-2012, 11:28 AM
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That's A-weighting. 105dB reference level peaks are at dBC I believe.
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post #3 of 17 Old 07-11-2012, 11:34 AM
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A lot of guys here don't have high sensitivity speakers and high output subwoofers for the sake of high volumes, they have them for uncompressed peaks and lower distortion. As far as hearing damage goes, I think the matter of long term exposure to low frequency noise isn't quite settled. Here is a study talking about the physiological effects of low frequency noise, and here is another one. I remember reading a military study about air pressure levels from blasts which did not cause any apparent physical damage but which was found to cause neurophysiological damage which resulted in PTSD symptons. One thing is for sure, enough SPL will cause damage at any frequency, although it may take more at low frequencies than at 2k to 4k which are supposedly the most vulnerable. Routinely watching and listening to stuff at reference level is a bad idea if you care about your hearing.
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post #4 of 17 Old 07-11-2012, 02:47 PM
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Most reference level movies are 85 dbs and the loud peaks are a split second! If one watches a movie at reference there is no danger. Now hours upon hours of demoing of the loudest scenes might be troubling but I bet that would still take many years to take effect.
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post #5 of 17 Old 07-12-2012, 06:26 AM
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According to the National Institutes of Health, "long or repeated exposure to sounds at or above 85 decibels can cause hearing loss..."
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post #6 of 17 Old 07-12-2012, 06:31 AM
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what? I can't hear you!
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post #7 of 17 Old 07-12-2012, 06:42 AM
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You guys all better stay inside and live in a bubble.
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post #8 of 17 Old 07-12-2012, 09:52 AM - Thread Starter
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Quote:
Originally Posted by MKtheater View Post

You guys all better stay inside and live in a bubble.

We've all been living in bubbles since about 2000. The dot.com bublle, the real estate bubble, and now the Facebook, LinkedIn, Groupon, etc. bubble.
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post #9 of 17 Old 07-12-2012, 04:32 PM
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Quote:
Originally Posted by MKtheater View Post

You guys all better stay inside and live in a bubble.


That is a bizarre thing to say.
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post #10 of 17 Old 07-12-2012, 04:35 PM
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I was replying to this and the other thread concerned about infrasonics. There are much louder and dangerous things outside than listening to a movie at reference levels, that is all.
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post #11 of 17 Old 07-12-2012, 06:57 PM
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Quote:
Originally Posted by MKtheater View Post

I was replying to this and the other thread concerned about infrasonics. There are much louder and dangerous things outside than listening to a movie at reference levels, that is all.

Quite true. In the last 20 years or so I've gotten residual ringing from only three sources: live music, running hedge trimmers all afternoon, and running my snow blower in the shed its stored in. And I do like to crank up the HT from time to time, though not as much as some here I suspect.
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post #12 of 17 Old 07-12-2012, 07:01 PM
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Quote:
Originally Posted by MKtheater View Post

I was replying to this and the other thread concerned about infrasonics. There are much louder and dangerous things outside than listening to a movie at reference levels, that is all.

Like 4 hour motorcycle rides at 80 mph?

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post #13 of 17 Old 07-12-2012, 09:03 PM
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Quote:
Originally Posted by kcnitro07 View Post

Like 4 hour motorcycle rides at 80 mph?
2 hours ride on a noisy bus + 12 hours on a plane
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post #14 of 17 Old 07-13-2012, 09:13 AM
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Quote:
Originally Posted by Skylinestar View Post

2 hours ride on a noisy bus + 12 hours on a plane

And you can still hear? :P

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post #15 of 17 Old 07-14-2012, 05:17 AM
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Quote:
Originally Posted by kcnitro07 View Post

And you can still hear? :P
Are you saying that all pilots and cabin crew are deaf? All bus & truck drivers are deaf?
Some monorails & trains are loud too. 85dB is common in these transports, and I mean inside the cabin/coach.
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post #16 of 17 Old 07-14-2012, 07:13 PM
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Quote:
Originally Posted by Skylinestar View Post

Are you saying that all pilots and cabin crew are deaf? All bus & truck drivers are deaf?
Some monorails & trains are loud too. 85dB is common in these transports, and I mean inside the cabin/coach.

Hearing damage doesn't necessarily mean deafness. Your sensitivity to high frequencies goes first, so partial hearing loss is far more common. I have seen the difference myself when I compared hearing test charts in a factory between workers who adhered to hearing protection guidelines and those who didn't.
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post #17 of 17 Old 07-15-2012, 05:56 AM
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Quote:
Originally Posted by dpc716 View Post

Quite true. In the last 20 years or so I've gotten residual ringing from only three sources: live music, running hedge trimmers all afternoon, and running my snow blower in the shed its stored in. And I do like to crank up the HT from time to time, though not as much as some here I suspect.

How much snow do you get in your shed? smile.gif
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