had your hearing checked recently? - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #11 of 25 Old 11-20-07, 06:04 PM
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Re: had your hearing checked recently?

I hate to bring back threads over a month old, but the degradation of my precious hearing is troubling me a lot.

I'm only twenty, but in the spring, a lapse in judgement partially brought about by Grain Belt Premium, resulted in a pretty major trauma to my ears. I was lighting my home made cannon and the fuse jumped, causing the blast from the vent hole to blow right in my face. The muscle in there contracted and i didnt start to hear better for at least four or five days. Needless to say i was pretty upset. Still am actually, as i do have a ring, and a noticeable distortion. Sounds almost like a blown tweeter.

I went to a doctor to make sure I hadnt perforated an eardrum, she sait it was just inflamed and other than decreased sensitivity, everything should come back to normal. Well not quite, but after having read mention of possible improvements through medical prosedures, I'm definately going to an audiologist. It pains me to not be able to tell the differance between an optical and medium quality analog cable from mt CD player, an excersise I once was good at, I can now barely tell.
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post #12 of 25 Old 11-20-07, 08:38 PM
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Re: had your hearing checked recently?

You have my sympathy.

I hate hearing damage and preach caution all the time.

I hope the conductive damage heals up and you regain all your hearing.
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post #13 of 25 Old 11-20-07, 10:03 PM
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Re: had your hearing checked recently?

Thanks for that, usually people seem to think "ah, well you can hear me talkin, right? Whats the problem?"

It takes an appreciation for aural pleasures to understand how this affects someone like us.
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post #14 of 25 Old 11-20-07, 11:08 PM
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Re: had your hearing checked recently?

Deep loud bass are the most domagable frequency...

I work as a DJ for about 10 years and I got some hearing problems now.

Is it a software we could download to check that ?

JP

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post #15 of 25 Old 11-23-07, 09:38 AM
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Re: had your hearing checked recently?

Everyone should be issued, at birth, some Etymotic ER-20 earplugs. Best $12 I've ever spent, and gsmollin is right, rock concerts sound better when they're not painful.

I wear my plugs on airplanes, sometimes in movie theaters, and obviously at concerts. I'm rarely without them.

My attempt at hearing protection evangelism.
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post #16 of 25 Old 11-24-07, 01:14 AM
 
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Re: had your hearing checked recently?

Quote:
tweeksound wrote: View Post
Having a certified audiologist check your hearing at any point is a good idea. They do it in a controlled environment so the results are more accurate each time and the test results give you a base line to compare to in the future. If you get a test done in 20 years, you will have both tests to compare and you can say "my hearing has degraded this much in these freq's since my last test"

An audiologist can also determine what % of the hearing loss is permanent and what % can be fixed by using bone conduction.
it's very often that at least some amount of hearing loss is fixable.

Loud bass is the most damaging to all frequencies. Low freq's don't need to even "seem" very loud to cause irreparable damage.

Here is a very useful and informative chart on what levels are damaging over how long.
http://www.gcaudio.com/resources/howtos/loudness.html

You might be surprised to find that even when you think you're being good you are still listening too loud and for too long.

I carry an SPL meter around and measure level a lot.
I also have ear plugs whenever I might be in a loud environment.

Gotta be careful.


Very interesting comment about damage at bass frequencies. I'm not sure that I would agree with it, based on the fact that longer wavelengths can't enter the tiny ear canal completely-formed, whereas high frequencies are closer to being able to do so because the wavelengths are closer to the dimension of the ear canal opening.

Low frequencies have such long wavelengths that they are almost completely ineffective at entering the canal, except by barometric pressure changes. If I were to agree with one theory, it would be that coupling is pressure mode, in that slower, but large, changes in barometric pressure can cause possible damaging excursions of the ear drum itself.

I looked at the link and some of the figures seem incorrect, particularly the orchestra:

Symphonic music peak 120 - 137dB

Since I record orchestras regularly, I measure the peak SPL from various locations in a typical hall. Some of the loudest peaks I've measured for a 60-piece orchestra were in the 105dB (flat) or 97dB(a-weighted) range from the balconey, and only 5-6 dB higher at the first row of the audience below. In fact, I've noted dramatic bass (room) gain toward the back of these halls, such that the bass instruments are more dominant way up there in the 'rush' seats.

I think that the loudest sound figure on that chart is inaccurate as well; I think the number is more like 197dB. Check this out:

The dB SPL equivalent figure is calculated like this:

Starting with the definition of 0 dB :

0 dB SPL = 0.0002 micro-Bars ( = 1/5000th)

( 1 Bar = atmospheric pressure.)

1 micro-Bar = 5000 times the SPL level of 0dB

1 micro-Bar = 20 log5000 = 74 dB SPL

1 Bar = 1,000,000 times the above pressure

20log 1,000,000 = 120

So adding 120 to 74 = 194 dB SPL

If you use the " correct " peak values ( ie 2 Bar and 0.00028
micro-Bar) the figure is then 197 dB SPL.

In simpler terms:

dB = 20*log(p/pref)
p at sea level = 14.7 psia = 101352.9 pascals
pref = 20 micropascals

So,

dB = 20*log(101352.9/0.00002)
dB = 194 for 1 atmosphere at sea level
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post #17 of 25 Old 11-24-07, 05:55 AM Thread Starter
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Re: had your hearing checked recently?

I have found a lot of those sites that list relative SPL's to be somewhat in contention myself. I don't necessarily dispute their measurments, but I do question if they are properly weighted and what other factors might be causing the measurements to be a little inacurate. The last time I saw a list of relative SPL's was in an article that was trying to insinuate that wind farms were extremely noisy, it did this by comparing measurements taken at different distances using different weightings. It would be nice if all sites like that qualified there measurements with specs on setup and environmental info.
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post #18 of 25 Old 11-24-07, 10:31 AM
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Re: had your hearing checked recently?

I have my hearing checked and charted once per year as part of my employer's hearing conservation program, as I'm exposed to very high sound pressure levels for extended periods of time.
Because I regularilly use hearing protection. I have no loss in either ear across all test frequencies (0 dB loss in either ear.)

But I still can't hear someone next to me in a high-noise environment, the audiologist indicated that is quite normal for those with exceptional hearing.

In fact, my hearing is so good, I can actually hear in the dark.
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post #19 of 25 Old 11-24-07, 03:42 PM Thread Starter
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Re: had your hearing checked recently?

Quote:
Bent wrote: View Post
In fact, my hearing is so good, I can actually hear in the dark.
Well I can hear it when light bounces of walls

Seriously, it is comforting to know I am not the only one who has trouble understanding language in a noisey environment.
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post #20 of 25 Old 11-24-07, 05:26 PM
 
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Re: had your hearing checked recently?

Another thing not mentioned in several of these sites is distance to sound producer. Distance affects the intensity of an isotropic radiator by the inverse square. So either these measurements are made up close to the instruments (literally inches away), or there are serious calibration errors with the instrument doing the measurement.
Weighting makes a 9dB difference with orchestral music, so the maximum unweighted sound pressure that I've seen with an orchestra is still under 110dB in the front row. The high 90s is more like it for A-weighted measurements. A hotel orchestra would come in even lower than this.
Club bands (amplified ballad rock) seem to peak at around 114dB (flat).
I frequently get a kick out of all the absurd SPL readings that competition car audio systems supposedly generate.

Regarding hearing, back when I was in my early twenties, I could hear bats' sonar shrieks at night in the park, where one could see the bats flying around and roosting in the willow trees. Those were the days.. When the first FM stereophonic multiplex broadcasts started happening, I remember being able to tell a station broadcasting stereo by the audible (to my ears) 19Kc pilot tone. In 1962, Lester Karg gave me one of his laboratory FM tuners, which I have had for over 35 years, and I could hear pilot tones on this tuner as well, because the low pass filter was only 6dB.oct slope. I never bought the Knight Kit stereo adapter for it, as my system back then was mono, with a single Aristocrat KD6 speaker enclosure. I had Bozak tweeters that Rudy Bozak gave me when he had his plant near where I lived at the time in Stamford, and they were about the best there was at that time, extending all the way to 20Kc. As such, I had no difficulty hearing the FM stereo pilot tones.

But now today I can't even hear the UPS truck pull up my driveway for a delivery.
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