Yep only as good as the weakest link.Thanks for the input (so far) everyone! Damn dogs.Tom, I tried your audio test files. I could easily hear 20HZ but only started to hear the upper frequencies somewhere between 12k and 13k but I suppose my results were effected by the headphones I was using. I'll try another pair later.
If you can hear 12-13k you must be able to hear below that, so maybe you need new headphones. 
Daryl, have you thought of a head transplant to improve hearing range?Yep only as good as the weakest link.
When engineers are mixing music they often lose part of the low frequencies as choice ie: anything up to 120hz. I do something like this when mixing. This is often noisy and cleans up the sound. As for 40Khz this is way beyond our hearing range. The 20hz to 20khz is best case cenario and most people over 25 can't hear to these frequencies. I would guess a lot of people on this forum would be hard pushed to hear frequencies above 15khz. I honestly don't see any advantage in having head phones that work to 40khz, but it probably looks impressive on the spec' sheet.Daryl,
I guess what I'm getting at, we may have the ability to hear between X to XXXXXXX yet, while listening to music and/or the human voice, is this even a factor? Or, how much of it is? Do we really, in normal circumstance, need speakers or headphones that range from 10Hz to 40kHz? I'm honestly asking a question here, looking for an explanation, not trying to state fact.
Glad you had fun with this Neil.Hi Tombo,
This was a fun excursion. I checked the links and didn't t really hear anything over 13kHz, although I did get the 20Hz. Obviously age has quite a bit to do with it because both my 20-something daughters heard the high one kick in at 19kHz, maybe 20, and ran screaming from the room by 16kHz.
Neil
Your daughters have young ears and obviously haven't been to too many raves or concerts where damage can occur. :blink: I did the test myself very quickly yesterday and could hear 15khz through my laptop speakers, so might be a little higher with headphones, which is suprising a little as my work involves listening to sound a lot. I thought my hearing might have suffered more over the years.
