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Calculation of effective mass of JMW10 tonearm?

Does anyone know how to calculate the "effective mass" of the JMW10 tonearm? Or better yet, can someone just tell me the number in grams? I am reading "How to Set Up and Tune Your Turntable and Tonearm" by George Merrill. In the booklet he recommends a tonearm resonance frequency between 8 and 16 Hz, 11 being ideal. I have already been told my just purchased ZYX R100FS (Fuji Silver high output) is a good match for the tonearm. But in trying to optimize the sound I need to know the tonearm resonance frequency which requires knowing the effective mass of the tonearm.

Help please. Thanks,
Jon
jonathanochi

Showing 1 response by dougdeacon

dougdeacon
3,338 posts
 
Kehut nailed it.

I haven't used a ZYX on a JMW, but VPI/Mike's suggestion to use both their 3g headshell weight and a lighter c/w mounted further aft sounds right to me. I have this vague recollection that the eff. mass of a JMW-10 is around 11g. If that's so then Mike's advice is spot on.

If you want to measure your resonance frequency, the HFN&RR test record has tracks specifically for that purpose. You'll be able to confirm resonance in both vertical and lateral modes to the nearest 1 Hz or so. A ZYX has different vertical and lateral compliance, so the resonance frequency will be slightly different in each mode.
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