http://www.isdial.net/~xanex/test/
the audiosweep.mp3 goes up past 16khz (high pitch) and the seperate mp3s will do the lower frequencys (20hz)
you'll need a decent set of headphones and a fairly quiet enviroment. if you hear weird high pitched noises during the low frequencys (30-15hz) then your soundcard sucks ?
