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In Reply to: RE: The Devore OrangutanHi posted by John Elison on October 03, 2014 at 08:35:51
Paul Klipsch spoke about this because horn loaded speakers have very small excursion. He called it FM as in frequency modulation distortion and compared it to the change in sound of a train whistle as the train 1st comes closer to you and then goes away.
Follow Ups:
Yes, intermodulation distortion is the same as frequency modulation distortion. Another name is Doppler distortion.
I met Paul Klipsch in Kaiserslautern, Germany not too long after he installed an anechoic chamber at his speaker factory. I asked him what he thought of Bose speakers and he got very excited because he had just measured them. He grabbed his binder of test reports and showed me the test results of the Bose 901 speaker, which he said was the only speaker he had tested that could produce over 100% intermodulation distortion. He measured a 10-kHz tone modulated by a 100-Hz tone with just the right amplitude but still within the speaker's power handling capability that produced 125% intermodulation distortion. He loved to show people those test results.
That level of intermodulation is not possible with ordinary speakers that contain both woofers and tweeters. The Bose 901 used nine 4-inch drivers to reproduce the entire frequency spectrum. In fact, each of the nine drivers was designed to handle all audio frequencies equally so that a long excursion 100-Hz test tone could easily modulate a low volume 10-KHz test tone to the point of producing 125% intermodulation distortion.
Best regards,
John Elison
But Bose doesn't matter. It's a lousy design that doesn't even do what it claims properly(ratio of direct/reflected sound) and as Gordon Holt wrote it's frequency response is a comb filter. But what was brilliant was the sales job Amar and his cohorts did using pseudo science with the most minimal hint of truth behind it.
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