The calculation charts are very useful at getting a ballpark figure before you purchase a cartridge. A test record is great ( I have one ) but you would be using it after you made the purchase. If you have to remove mass then you will be SOOL!!
Tonearm effective mass
I have read about and think I have a basic understanding of matching cartridge compliance and tonearm effective mass. I also have read a bit about how effective mass relates to moment of inertia, and how one can alter this by different combinations of counterweight/pivot point distance. What I havent seen, and I would think would be easier, is the effect of adding extra weight, ie heavier screws, in attaching the cartridge to the headshell...would this not, as well, increase the effective mass/moment of inertia? .help in understanding this would be appreciated...thank you
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Dear @jw944ts : " ie heavier screws, in attaching the cartridge to the headshell...would this not, as well, increase the effective mass/moment of inertia? "
The plain answer is yes but you do not be anal to this issue .
Regards and enjoy the MUSIC NOT DISTORTIONS, R. |
+1, Raul. In the calculation for effective mass, all mass counts, including the weight of the cartridge itself, the weight of the headshell, and the weight of any hardware. Thus using heavier than normal screws will increase the calculated effective mass, M. Because the screws are essentially in the same physical location as the cartridge, and because that net mass is at the very end of the tonearm, adding heavier screws has a more or less linear effect on the effective mass, M. In other words, if the new screws weigh 2g more than the old ones, add 2g to effective mass. Since resonant frequency is in the denominator of the equation used to calculate it, any increase in M will lower Fr. |
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