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 kehut

Jon-

I seem to remember asking that same question to Mike at VPI several years back. Now, I cant remember what the number was off hand. Unfortunately, the JMW 10 manual doesn't specify as you are likely aware. As Jmcgrogan2 suggests..place a call or email to Mike @VPI for that info to help you. At times..Harry will be on the other end to chat.

As an owner of the Aries 2-JMW10 with a ZYX R-100 Fuji Silver H..I can unequivically say that this cart is MARVELOUS with that arm!

BTW...one thing that you may have already noticed is that due to the light 5g weight of that cart..you will need either a lightweight counterweight for the 10 arm or use the VPI supplied 3g headshell weights. Mike at VPI actually suggest using both together, even knowing that it will put the CW a little further back on the arm. I use only the new dropped lightweight CW and that works great. The Fuji is not avail as you know with the SB option as on the Airy models..otherwise that would have done it.

Happy listening! ;) ...Ken