Re: [DucatiST] Re: It's intercom time, but which?

 

On Sun, Jun 24, 2012 at 10:53 AM, The Ear Plug Guy <normmatzen@yahoo.com> wrote:

Also, there is an audiological phenomenon called "Up ward spread of masking" which means that a loud low frequency noise, like wind noise, can mask out higher frequency sounds that may be desirable. So, decent ear plugs with a hi fidelity 20-25 dB attenuation will reduce the wind noise as well as allow you to hear environmental sounds like sirens, horns and your sweety saying,"Slow Down!"

Not only that, but the low frequency noise is more damaging to the ears than high frequency noise.

Etymotics used to publish the measured isolation chart by frequency for the ER-4 and ER-6; both were excellent (almost as good as quality soft earplugs) but I can no longer find it on their web page. It may still be there somewhere though.

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