Forgive the headset thread...

It doesn't need ANC, because it is in-ear. It blocks all outside noise, so the volume is crystal clear, and it blocks out more noise than my ANR DCs.

Ah, my friend that is where you are wrong. The noise that is most harmful to one's ears is in the lower spectrum and only ANC does that job well. Ear plugs, especially those with holes, dont block those low frequency noises very well. So, an in-ear system with ANC would be the best of all worlds.

I refer you to the noise attenuation capabilities of ear plugs as outlined in figure 5.4 of this article:
http://www.nonoise.org/library/ane/ane.htm
<center></center> <center>
pg41_ns5.gif

Notice that the good attenuation STARTS above 1000hz. Now, the good folks at lightspeed have clearly pointed out the benefits of ANC in this article:
http://www.lightspeedaviation.com/c...ive-Noise-Reduction/Section-3-Airplane-Issues

Notice in their graphs that ANC works best for frequencies BELOW 1000hz. This is the frequency range of many airplane engines and is the range that, eventually, does the most hearing damage.

Therefore, the best of many worlds would be if in-ear makers (homebuilt or otherwise) would incorporate ANC into their headsets. This is why I will continue to use ear-muff style headsets until ANC is put in the earplug models.

...Just my 2 cents
</center>
 
Ah, my friend that is where you are wrong. The noise that is most harmful to one's ears is in the lower spectrum and only ANC does that job well.

Maybe so. I was talking in terms of my perceived comfort in the cockpit. They are just as quiet as my ANR DC's, although I guess they may not block out all the noise...? I dunno, not a scientist, just a cheapskate. :laff:

Here is a link to a new thread. Sorry for the hijack!

http://forums.jetcareers.com/general-topics/79203-cheap-homemade-aviation-headset-thread.html
 
http://www.quiettechnologies.com/ Would have you believe differently..

Check out the simulator tab.

No, actually they are saying the exact same thing I am saying. The simulator .wav sounds specifically state " 10-35dB passive attenuation in highs." ...as in high frequency. Now, high frequency noise (where human speech is generally located), when attenuated, can make for some difficult hearing/understanding of what is being said. I have no argument that earmuffs can mess this up. BUT, that's not where HEARING DAMAGE is going on.

It's those pesky low frequency waves at high amplitude (high Db levels) that ruin your hearing over time. I do think that in-ear designs are a good idea, all I ask is that the in-ear makers simply add ANC to their systems to make them perfect.

Just my 2 cents once again (I happen to be a physician, but I am not an ENT...I just know several who have backed me up on this when I have asked). I would love to hear from our friendly neighborhood flight surgeon on this subject. Any comments from him?.....
 
Ah, my friend that is where you are wrong. The noise that is most harmful to one's ears is in the lower spectrum and only ANC does that job well. Ear plugs, especially those with holes, dont block those low frequency noises very well. So, an in-ear system with ANC would be the best of all worlds.

I refer you to the noise attenuation capabilities of ear plugs as outlined in figure 5.4 of this article:
http://www.nonoise.org/library/ane/ane.htm

<CENTER></CENTER><CENTER>
pg41_ns5.gif

Notice that the good attenuation STARTS above 1000hz. Now, the good folks at lightspeed have clearly pointed out the benefits of ANC in this article:
http://www.lightspeedaviation.com/c...ive-Noise-Reduction/Section-3-Airplane-Issues

Notice in their graphs that ANC works best for frequencies BELOW 1000hz. This is the frequency range of many airplane engines and is the range that, eventually, does the most hearing damage.​

Therefore, the best of many worlds would be if in-ear makers (homebuilt or otherwise) would incorporate ANC into their headsets. This is why I will continue to use ear-muff style headsets until ANC is put in the earplug models.​

...Just my 2 cents​

</CENTER>


:yeahthat: I personally would never trust anything just in my ear. I've seen substantial hearing loss first hand (Father used to work on a ramp, later flew for US CHECK). I wear ear plugs and my headset (ANC) as much as I can. Maybe it can really provide the same protection, but I feel much better having something around my ear providing a seal rather than just in there with no ANC.
 
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