Agreed Dan, I would probably say that it's a 25db attenuation figure is more
realistic/true.
Cheers,
Eric
On 07/02/2013, at 3:01 AM, Dan Dugan <> wrote:
> > I use the Sennheiser HD 280. They are very good cans that are mostly used
> > by DJ's because they are closed circumaural headphones with 32db reduction
> > of external noise. I find that when I use these cans for sound recordings
> > that I ask myself repeatedly "did that sound just come from outside the
> > headphones?", yet, it hasn't. They isolate so well that everything you hear
> > comes through the microphones, the recorder and the headphones.
>
> That 32dB figure is misleading. Probably true for like 8KHz but much less
> lower down. I know because I bought that model for a scientific experiment
> where people were listening to natural environments at calibrated natural
> levels, in a closet with activities going on outside. Simply not adequate,
> and I had to eat crow. I went for the airport-worker type isolators modified
> with headphone drivers and those did the trick. I'm not being coy about the
> name, no internet on this airplane. I think they were Superphones or
> something like that.
>
> -Dan
>
>
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