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Does this test really measure IMD?

Posted by sser2 (A) on May 24, 2004 at 14:56:37

In Reply to: Shure V15VxMR Intermodulation Distortion Measurements posted by John Elison on May 24, 2004 at 10:20:46:

I used to think that IMD distortion is amplitude modulation of low level high frequency signal with high level low frequency signal. Amplitude IMD does not involve changes in harmonic structure of the signal. What you show is frequency modulation. 4,000 Hz signal mixed with 200 Hz gives out some 3,800 and 4,200 beats. This beats phenomenon is not a distortion, it naturally occurs when two signals of different frequencies merge. The amplitude of beats is determined by amplitudes of component signals.

Anyway, there is no reference point in your test. The distortion could already be in the groves, or come from the amplifier. I would predict that Dynavector will show basically the same type of response.

Very interesting measurements, but what do they mean?

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