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Re: Intermodulation

Posted by Wayne Parham on May 12, 2003 at 04:18:05:
Hello again Dennis!
I think it's interesting too. Thanks for the link!
About intermodulation - I've built two-way speakers and three-way speakers over the years, and I've run various crossover points from 250Hz to 3kHz. JBL seems to prefer 1kHz to 2kHz for their large-format two-way speakers, and I do too. There is a writeup about JBL's reasons for this design philosophy in the paper called "Improvements in Monitor Loudspeaker Systems," written by David Smith, Don Keele and John Eargle. This paper was written specifically about the two-way loudspeaker you mentioned - the JBL 4435 - and it's single woofer "brother," the 4430.
Where I've found IM problems in some systems is as the woofer nears its excursion limits. An example is a deep bass note played below the Helmholtz frequency causing noticable IM distortion of higher frequency content. I used to notice this on some speakers in stereo shops when playing the heartbeat at the beginning of the Pink Floyd "Dark Side of the Moon" album. But when the volume is reduced so the woofer backs away from its excursion limit and presumably back into its linear operating range, this noticable problem goes away.
Wayne