[BobM]

http://www.phys.unsw.edu.au/jw/hearing.html

I didn't quite follow the rules on mine, since I'm using a laptop and some Koss Sporta Pro headphones (not sealed) from work, where there's a good amount of background noise. But this does give you an approximation of your hearing curve.

Certainly an interesting test overall. Mine kind of looks like a "W" with less sensitivity at the bottom and top (could partially be the soundcard and headphones here) and also less sensitivity around the 1kHz starting tone and those around it.

[SwedeSound]

Interesting indeed. I used my semi-closed/mostly open Sennheisers in a quiet apartment. And here's what I heard (with the computer volume cranked, if that makes a difference).

[Steidl Guitars]

The well-known Fletcher-Munson curve.  You're a human!   

http://en.wikipedia.org/wiki/Fletcher%E2%80%93Munson_curves

[SwedeSound]

HA! That's what I was hoping for. Interesting also to see where those levels pretty much disappear -- well before the levels of most average loudspeakers. So, while I know that my speakers have a dynamic range of 40hz-35khz and perhaps some bits of music aren't being transmitted, they're hardly missed. I can't hear to those extremes anyway!

[stereocilia]

I've seen this before, looks like the link is broken.  Do you know if that is in dB SPL or dB HL?

[BobM]

Interesting indeed. I used my semi-closed/mostly open Sennheisers in a quiet apartment. And here's what I heard (with the computer volume cranked, if that makes a difference).

That's more of what I would have expected on my own test. The fact that I got what looks like a "loudness enhanced" curve makes me think the headphones I used were tailored that way. It makes sense since they are used on a Walkman CD player.

[stereocilia]

I wouldn't take too much from the outcome of this test since everybody's ear shape and playback equipment is different.  At extremely high freqeuencies the ear canal and pinna will contribute to massive differences from person to person and from headphone to headphone.  But, If you compare your hearing to somebody else's from say, 250 Hz to 8 kHz, then I think you can be more certain about the validity.