On 24-11-07 11:49, Vladimir Mosgalin wrote:
> PS a bit of OT: I'm 24, and I barely hear 18khz (in headphones), unless
> it's VERY loud - I can hear only up to 17500-17800 clearly at average
> volume level. Is there something wrong with my ears or it should be like
> this?
You're perfectly fine. It all depends on "average" and "very" in the above
but if you hear 17+ kHz at... average-average levels you could call this
fine hearing. Nice reference:
Ahmed, Dennis, Badran, Ismail, Ballal, Ashoor, Jerwood:
"High-frequency (10-18 kHz) hearing thresholds: reliability and effects of
age and occupational noise exposure"
http://occmed.oxfordjournals.org/cgi/reprint/51/4/245.pdf
If you look at table 1 there, you see that for your age group, 100 dBSPL (*)
is to be expected for 18 kHz which is indeed "VERY loud".
The 20 kHz upper bound that is normally used is just that, an upper bound
and if we're talking about "young" ears in those ranges, we're talking
baby-young.
(*) http://en.wikipedia.org/wiki/Sound_pressure_level
Rene.
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