I agree, that's a great site. I stumbled upon it a few years ago when I was looking for an equalizer.
Here are few more links you might enjoy...
1) If you are interested in the science of acoustics and hearing, this site has a wealth of information:
2) A good collection of sound test and test tones can be found at audiocheck.net. I especially like the collection of tests for headphones.
3) And lastly, if you'd like to know how "flat" your hearing is try this next site. Just make sure you heed the posted warnings before proceeding with the test.
(Note: We've all seen headphone frequency response charts and they are helpful for understanding the sound signature of a headphone. What I think would really be interesting to see are "reviewer hearing" frequency response charts. Can't say that I've ever seen one of these.)
Edited by jazzfan - 1/25/14 at 12:25am