check this out!!

[Pilgor]

this is so cool. It is a sound board where you can test different frequency. some of them really hurt a lot, so you are warned. If you have any animal such as dogs or cats, you may not want to use it.
http://www.jimmyr.com/blog/hearingloss.html

[pizlo]

Thats pretty cool, I can just barely hear 17000 what about the rest of you?

[Pilgor]

I want to take one of these freq, and put it on the intercome at school, give everybody headaches.

[hi]

i can just barely hear 20000

edit- i dont think im doing it right because i can hear 50hz.

[potatoflinger]

It was kind of weird, my dog was sleeping right next to me the whole time I was playing the different sounds, and I played every single one but she didn't react to any of them.

[jimmy101]

There is a pretty good chance that generic computer speakers won't reproduce anything above about 15KHz or bellow 30Hz.

Could just be that your $8 speakers can't keep up.

[Sticky_Tape]

That thing is soo cool I asked my 40 year old dad if he could hear
18000 Hz but he couldn't hear a thing!

[TurboSuper]

I can hear 17kHz just fine. 18k+ I can kind of make something out, but I think it's just my headphones doing err...something rather than a genuine tone.

[STHORNE]

That is sooo cool. I recorded it on my cell and set it as a ring tone (so my parents couldn't hear it but i could). I used the 17kHz one. Thanks for the link Pilgor

[Hydra]

Lol so cool. I cant hear 17kHz but i can sort of hear a tingle (if u know what i mean)
I dont know if my speakers can make the 50Hz, cuz i cant hear it.

[STHORNE]

if you are using the default speakers (ones that came with computer) than most likely, they are of too poor quality to project pitches that high.

[DYI]

I can hear up to 19kHz fine, and a bit at 20kHz. I can also hear 50Hz fine, but I don't think my speakers can output anything below that.

[Carlman]

well my sub went crazy at 50hrtz

and i can hear 21,000 hrtz barely

[elitesniper]

Wow, that really hurt my ears..(what did you say?!)

[Hotwired]

Using my normal gaming/music headphones:

15hz - 50hz = nothing
8000hz - 16000hz = audible
17000hz - 19000hz = nothing
20000hz - 22000hz = audible

Using a special piezo earpiece:

15hz - 22000hz audible