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

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post #11 of 26 Old 10-28-07, 10:34 PM
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Re: had your hearing checked recently?

drf wrote: View Post
I had my hearing tested about a year ago now, then it was good down to 10dB and upto 19K. Not bad for 32. However of late I have noticed I am starting to have a lot of trouble understanding speech in environments slightly louder than normal. I also am starting to have trouble hearing dialogue in movies if I am chewing (not generally a problem before).

Does anyone else have similar experience? has your hearing been checked recently and been good, yet think you may have problems still?

My worst fear is loosing my hearing or aspects of it.
I hear ya. My hearing has degraded with age. It began with a really nasty cold, or a strain of influenza that caused my ears to blockup, become blocked with wax, and my right ear began ringing. The ear blockage and wax could be corrected quickly, but the ringing, or tinitus, continued. I used some headphones and a signal generator to find the frequency, which would actually beat with the headphone tone. It was at 4200 Hz.

I went to the specialist, and told him I had a ring at 4200 Hz, and he ran the usual tests. His response to the results was raised eyebrows at the exact loss of hearing at 4200 Hz. Doctors think patients know nothing. Anyway, it's permanent. Nobody knows how to prevent or cure tinitus, but I can give you some precautions, good for anybody.

1. Don't listen to loud sounds for long periods. This can be anything. I wear earplugs when I cut the lawn. Years ago, I went to rock concerts, and wore earplugs. It actually improves the sound.

2. If your ears block up, use a decongestant. Don't let an infection get started.

3. Wash your hands a lot during cold season. Avoid people who are sick.

4. Enjoy your young and superior hearing responsibly. It won't last forever.
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post #12 of 26 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 #13 of 26 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 #14 of 26 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 #15 of 26 Old 11-20-07, 11:08 PM
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post #16 of 26 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 #17 of 26 Old 11-24-07, 01:14 AM
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Re: had your hearing checked recently?

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.

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


dB = 20*log(101352.9/0.00002)
dB = 194 for 1 atmosphere at sea level
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post #18 of 26 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 #19 of 26 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 #20 of 26 Old 11-24-07, 03:42 PM Thread Starter
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Re: had your hearing checked recently?

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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