On Thu, Dec 4, 2008 at 12:37 AM, Richard Dobson
<richarddobson@blueyonder.co.uk> wrote:
> Andres Cabrera wrote:
>>
>> Hi,
>>
>> Also be aware that ears are not linear in their relation of amplitude
>> and frecuency, i.e. different frequencies at the same amplitude will
>> be heard at different loudness.
>>
>
> And further, that  the same tone at different loudnesses  will be heard at
> different pitches, e.g. louder-->flatter, quieter-->sharper.
>
> Richard Dobson


I've heard this in reference to the extremes, towards the higher and
lower ends of the audible spectrum; I forget the name given to it, but
I've verified it myself with several-kHz tones, changing the amplitude
and hearing a pitch change.  I'm not sure how strong it is in the
mid-range, I can't detect it so much.

-Chuckk