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RE: Frequency range: 20Hz - 70 kHz. What's the point of........

> Hagerman's electrical resonance model is valid only in the electrical realm.

You are absolutely right. My model is valid only in the electrical realm, too. I've been trying to tell you that for years. However, the thing that matters is that high inductance cartridge have their electrical resonance within the audible range between 10-kHz and 20-kHz, and this causes audible problems regardless of how their cantilever mechanical resonance interacts. Low inductance moving coils do not have an electrical resonance to contend with until you get into the megahertz region. Consequently, their cantilever mechanical resonance can be dealt with by using stiffer cantilevers to move it out of the audible frequency range. The mechanical cantilever resonance of the Dynavector 17D3 is 80-kHz, which removes if from audible frequencies. In fact, just about all moving coil cartridges have their mechanical cantilever resonance well above 20-kHz so it does not fall into the audible range. The reason that low-output moving coils have a rising frequency response in the high frequencies is because their mechanical cantilever resonance is purposely under-damped in order to reduce phase shift within the audible range. Ortofon was able to manufacture moving coils that exhibited very little phase shift within the audible frequency range by under-damping the cantilever mechanical resonance and moving the electrical resonance out beyond 1-MHz. This is what makes low-output moving coils sound better than high-inductance moving magnets.

Goodbye again,
John Elison

PS. There will be absolutely no difference between a Spice analysis of Hagerman's electrical model and my electrical analysis. As long as you use the same electrical model, there can be no difference unless Spice is designed incorrectly, and I seriously doubt that is the case.

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