AVS Forum banner

1 - 17 of 17 Posts

·
Registered
Joined
·
1,925 Posts
Discussion Starter #1
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 (
106 dB - 3.75 minutes (
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?
 

·
Registered
Joined
·
5,197 Posts
That's A-weighting. 105dB reference level peaks are at dBC I believe.
 

·
Banned
Joined
·
8,743 Posts
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.
 

·
Registered
Joined
·
19,672 Posts
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.
 

·
Registered
Joined
·
8,353 Posts
According to the National Institutes of Health, "long or repeated exposure to sounds at or above 85 decibels can cause hearing loss..."
 

·
Registered
Joined
·
1,925 Posts
Discussion Starter #8

Quote:
Originally Posted by MKtheater  /t/1419797/permissible-exposure-time-guidelines-sound-pressure-level-spl#post_22211818


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.
 

·
Banned
Joined
·
8,743 Posts

Quote:
Originally Posted by MKtheater  /t/1419797/permissible-exposure-time-guidelines-sound-pressure-level-spl#post_22211818


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


That is a bizarre thing to say.
 

·
Registered
Joined
·
19,672 Posts
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.
 

·
Registered
Joined
·
902 Posts

Quote:
Originally Posted by MKtheater  /t/1419797/permissible-exposure-time-guidelines-sound-pressure-level-spl#post_22213769


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.
 

·
Registered
Joined
·
334 Posts

Quote:
Originally Posted by MKtheater  /t/1419797/permissible-exposure-time-guidelines-sound-pressure-level-spl/0_100#post_22213769


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?
 

·
Registered
Joined
·
3,057 Posts

Quote:
Originally Posted by kcnitro07  /t/1419797/permissible-exposure-time-guidelines-sound-pressure-level-spl#post_22214127


Like 4 hour motorcycle rides at 80 mph?
2 hours ride on a noisy bus + 12 hours on a plane
 

·
Registered
Joined
·
334 Posts

Quote:
Originally Posted by Skylinestar  /t/1419797/permissible-exposure-time-guidelines-sound-pressure-level-spl/0_100#post_22214361


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

And you can still hear? :p
 

·
Registered
Joined
·
3,057 Posts

Quote:
Originally Posted by kcnitro07  /t/1419797/permissible-exposure-time-guidelines-sound-pressure-level-spl#post_22215467


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.
 

·
Banned
Joined
·
8,743 Posts

Quote:
Originally Posted by Skylinestar  /t/1419797/permissible-exposure-time-guidelines-sound-pressure-level-spl#post_22217654


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.
 

·
Registered
Joined
·
658 Posts

Quote:
Originally Posted by dpc716  /t/1419797/permissible-exposure-time-guidelines-sound-pressure-level-spl/0_100#post_22214119


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?
 
1 - 17 of 17 Posts
Top