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 jonathanochi

Sorry to be slow in thanking everyone for their suggestions. My computer network was down. I got way behind on everything.

I did contact Mike at VPI, John and Ken. That was a good suggestion. Doug, your memory of the effective mass of a JMW 10 at around 11 was very close. Mike says it is 10.3 grams. And, Carl, I ordered and then set up my arm with the lightweight dropped counterweight and the headshell weight. Although when I weighed mine it came in at just shy of 5 grams instead of 3 grams.

In any case, the JMW 10 with the ZYX R100FS (silver Fuji) sounds fabulous. It is so very quiet and clean. I am very, very pleased.

Jon