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Old 05-02-2012, 10:03 PM   #11
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My old car stereo would hit 141.5 dB back in the day. I didn't wear hearing protection to drive around. People said I'd be deaf by the time I was 18, then 21, and so on. I've grown up and I can still hear but with kids in the truck I don't crank on it. Back on topic, I had always read you had to double amplifier power to see a 3dB increase which sounded twice as loud.
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Old 05-02-2012, 10:53 PM   #12
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My old car stereo would hit 141.5 dB back in the day. I didn't wear hearing protection to drive around. People said I'd be deaf by the time I was 18, then 21, and so on. I've grown up and I can still hear but with kids in the truck I don't crank on it. Back on topic, I had always read you had to double amplifier power to see a 3dB increase which sounded twice as loud.
Fact is that your hearing has suffered from cranking your tunes. (I did the same thing.) Once the damage is done, it won't recover. I used to do allot of things without hearing protection. I wear hearing protection all the time anymore. I have to at work and it has carried over to home as well. We have annual hearing tests at work as required by OSHA. Thankfully mine has stayed steady. I attribute this to being well informed on the job site and taking that attitude home. They encourage us at work to take hearing protection home with us.
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Old 05-02-2012, 11:59 PM   #13
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I am 62 and wear hearing aids. While I never was much of a loud music person, I was and still am a fresh air fiend. Wind blast destroyed my left ear and my aviation career put paid to the other one and finished the job on my left.

Ear protection was required (even in the early 70's) and by the time I had 500 hours in the C-130 I was wearing double hearing protection.
Double Protection is ear plugs under ear muffs.
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Old 05-03-2012, 12:08 AM   #14
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Hearing loss after the Industrial Revolution greatly increased. Some hearing loss may attributed to old age however most hearing loss is due to repeated exposure of the "loud" things in our daily life.
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Old 05-03-2012, 02:54 AM   #15
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Snowmobiles in Wisconsin have to be 88 DB or lower by law and trust me it isnt as loud as you would think it would be. I ride Harleys and if just around town I dont worry about it but on long rides I wear ear protection for the wind noise. I think repeated and prolonged exposure will cause damage
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Old 05-03-2012, 07:26 AM   #16
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I think I see what you are driving at and this article explained it so even I, (dense as I am) can understand it. My problem was equating an increase in power as a direct relationship with "loudness."
Herk, Yeah "loudness" a tricky subject because you would think that two of the same generators running side by side would be twice as loud as one generator. But is ain't so, and this just doesn't "jive" in most people minds.

Thanks for the link,

P.S. Not to confuse the subject, but two generators actually creates less than 2 times the noise "power" because each source of noise is indepenent, so some of the noise cancels out. It will actually be about 1.41 times more noise "power".

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Old 05-03-2012, 08:46 AM   #17
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Something to remember about "close to" when talking about decibels of noise. Decibels are on a logarithmic scale.

That means if a generator is rated at 30 is compared to a generator that is rated at 40 at full power, the one rated at 40 is 10 TIMES louder than the one rated at 30.

Decibel - Wikipedia, the free encyclopedia

Another way of putting it; if the "sound pressure" on your ears has a power of 1,000 at 30 DB, the 40 DB generator puts out 10,000 pounds of ear pressure at 40 DB.

A "normal" conversation comes in at 60 DB; at 85 DB, permanent hearing damage is guaranteed. The sound pressure of a 747 at takeoff power is 80 DB.

While sound pressure decreases with the "square" of the distance from the source; you can see that a very small increment of sound measured in DB is a LARGE increase in sound pressure.

We won't go into when the DB level of generator "drone" becomes annoying since that is different for different people.
I used to work on fighters for over 20 years and when they are chained down to do a burner runup the noise level can exceed 165db. We wore ear plugs and ear defenders and it was still loud standing beside the aircraft. I have included a link to a chart from an F22 which are quiet compared to the older century series a/c.
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Old 05-03-2012, 08:55 AM   #18
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I used to work on fighters for over 20 years and when they are chained down to do a burner runup the noise level can exceed 165db. We wore ear plugs and ear defenders and it was still loud standing beside the aircraft. I have included a link to a chart from an F22 which are quiet compared to the older century series a/c.
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The Wiki chart I was using seemed low to me as well; but the example was repeated in several sources I looked at.

I can only assume the DB was read quite a distance from the plane.
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Old 05-03-2012, 10:15 AM   #19
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Ear plugs and muffs can only provide so much protection. When the sound pressure levels get to a certain point they are being conducted through flesh and bone to the unprotected side of the ear.

Lou, our range engineer has dual hearing aids from 105s howitzers. It sure makes arguing with him difficult especially when the batteries need replacing...
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Old 05-09-2012, 07:34 AM   #20
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My flight manual says ear plugs required at 85 DB.
I'm getting out of the Military Police due to hearing loss from working Air Field Security and having to flip on he siren all the time doing traffic.

Guess we are expendable trade because we never got the 85db briefing in any manual.
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