Regardless of whether or not this test is bunk or not, this person's website has a lot of cool audio samples: Subwoofer Harmonic Distortion test: http://www.au

Regardless of whether or not this test is bunk or not, this person's website has a lot of cool audio samples: Subwoofer Harmonic Distortion test: http://www.audiocheck.net/testtones_subwooferharmonicdistortion.php http://www.audiocheck.net/testtones_subwooferharmonicdistort... Polarity test: http://www.audiocheck.net/audiotests_polaritycheck.php http://www.audiocheck.net/audiotests_polaritycheck.php Practical effects of bit depth: http://www.audiocheck.net/audiotests_dithering.php http://www.audiocheck.net/audiotests_dithering.php Headphone Ultimate Test (the binaural audio one is pretty awesome): http://www.audiocheck.net/soundtests_headphones.php http://www.audiocheck.net/soundtests_headphones.php