06-07-2015, 10:20 AM
(09-21-2014, 07:54 PM)Shannon Wrote: Both appear to be hitting 20 kHz, but the iMac speakers appear to be, by your description, doing a much better job of expressing it than the Logitechs. It sounds like the Logitechs are suffering from some sort of wear and tear in some way. Loose connection maybe. You should not hear anything after 18-19 seconds on the test audio unless you have exceptional high frequency hearing, and even then it should be even and continuous rise in pitch from both stereo channels.
Shannon said that here: http://subliminal-talk.com/thread-4735.html
I've ran the audio test on all the speakers I use for the ultrasonics. All equipment, including my tvs passed the test and I could clearly hear that continuous rise in pitch without a problem until it gets silent at the very end of the test. I also tested my computer speakers which shouldn't pass, they did have distortion. So it's definitely possible to hear the pitch with the proper equipment.
