> (Maybe I should get better speakers...) Maybe, but you can test your hearing range more easily by putting on a set of headphones and experimenting with the l

> (Maybe I should get better speakers...) Maybe, but you can test your hearing range more easily by putting on a set of headphones and experimenting with the linked signal generator -- reasonable quality audio headphones should easily be able to exceed your own hearing range on the high end. And chances are typical computer speakers should also be able to exceed a normal hearing range.