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In Reply to: No, if they have the same effective mass they will react the same. (nt) posted by John Elison on November 17, 2005 at 14:29:35:
If simply calculating resonant frequency with a particular cartridge yes.But I think (feel) tracking stability etc. can differ between two arms of the same eff. mass but different distribution.
Follow Ups:
Well, you can certainly move the center of mass around. Ideally, you want the center-of-mass to be in a vertical plane that includes the stylus and horizontal pivot. Additionally, you want the center-of-mass to be located slightly below the vertical bearings to give the tonearm stability when balanced. In other words, if you balance the tonearm so that the stylus floats above the vinyl, you want it to return to its balanced position when you push it up or down. This will only happen when the center-of-mass is below the plane of the vertical pivot. If the center-of-mass is above the plane of the vertical pivot, the tonearm will be unstable and not return to its place of balance. I don’t think any tonearm has its center of mass above the plane of the vertical pivots, but it can be lowered even further by replacing the counterweight with one that hangs very low. Other than center-of-mass, there is no difference between two different arms with the same effective mass.Of course, there are lots of silly things you can do to change the sound of a tonearm and affect tracking stability, such as decoupling the counterweight, decoupling the headshell or cartridge, using springs that vibrate or wires that rattle, etc., but if the tonearm is perfectly stiff, there will be no difference between tonearms with identical effective mass and center-of-mass regardless of mass distribution differences.
Incidentally, the longitudinal center-of-mass is determined by the VTF and located slightly in front of the vertical pivot, or else it could be exactly coincident with the vertical pivot as in the case of a SME V with spring loaded VTF. On the other hand, the spring loading on Rega tonearms is in the opposite direction, which placed the center-of-mass farther ahead of the vertical pivot than normal arms. However, I don’t think this has any effect on tracking stability.
Best regards,
John Elison
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