Home Speaker Asylum

General speaker questions for audio and home theater.

Re: But why?

Well, hearing ultrasonic frequencies is controversial, to say the least. It takes more than just the signal being present and people being able to detect a difference. What seems to happen is that when when the ultrasonic frequencies can intermodulate with other frequencies in the speaker driver and produce intermodulation distortion (difference tones) in the audible range.

-Audio Engineering Society Convention Paper 5401, presented at the 110th Convention, 2001 May 12-15, Amsterdam, The Netherlands:
"Detection threshold for tones above 22 kHz," by Ashihara Kaoru and Kiryu Shogo, National Institute of Advanced Industrial Science and Technology 1-1-4 Umezono Tsukuba, Ibaraki 305-8568, Japan.


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"Opposition brings concord. Out of discord comes the fairest harmony."
------Heraclitus of Ephesis (fl. 504-500 BC), trans. Wheelwright.


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