[Don Pearce[_3_]]

On 30 Mar 2017 17:01:32 -0400, (Scott Dorsey) wrote:

Don Pearce wrote:
But what do you do when the years move on and some correction is
needed? Here's a pair of self-administered audiograms, from 2001 and
three days ago. I've actually won a bit of bass, but the top end is
vanishing fast.

http://www.soundthoughts.co.uk/look/audiogram.png

What you do is you spend time listening to live sounds, so you know what
live sounds should sound like _through your ears_ and you can mix things
to sound like that.

These were taken with a nice pair of Stax phones, so they should be
pretty reliable. On the recent one you can see a masking peak at 4kHz
caused by tinnitus.

I wouldn't trust anything above 4kc made with any standard headphones,
because tiny changes in headphone placement can make enormous differences
in the measurement. If the measurements were made with swept sines you'd
be able to see the comb filtering effects from the headphones, but since
they are made only with a few discrete tones, where those tones fall on
the comb makes a huge difference in accuracy.

The audiologists will use headphones designed for careful positioning
which gives you accuracy up to 8kc. Beyond that... you just have to use
your ears...
--scott

Tada! The measurements were not actually made with discrete tones,
but narrowband noise - at 10kHz it was about 100Hz wide. I was aware
of the problem with tones, and I've done my best to counter it. Here,
the spectrum of the 5k tone

http://www.soundthoughts.co.uk/look/5ktone.png

So no, maybe not audiology-accurate, but I totally believe the loss
above 5kHz.

d

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