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In Reply to: My point - posted by M3 lover on June 6, 2017 at 22:14:23:
The effective mass of any tonearm is simply its moment-of-inertia about its pivot point divided by the square of its effective length. The difficult part is determining a tonearm's moment-of-inertia because its mass distribution is so nonuniform. The only accurate way to determine its moment-of-inertia is to measure it.
The advantage of effective mass is that it allows us to compare the inertia of different length tonearms directly whereas their moments-of-inertia are not directly comparable. Two different length tonearms having the same effective mass will react identically with cartridges of the same mass and compliance; however, their moments-of-inertia will be different. The longer tonearm will always have a larger moment-of-inertia than the shorter tonearm even though their arm/cartridge resonance frequencies will be identical when using the same cartridge.
Best regards,
John Elison
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Follow Ups
- RE: My point - - John Elison 06/7/1706:09:27 06/7/17 (6)
- RE: My point - - Inmate51 08:30:10 06/7/17 (5)
- Relax - Lew 17:55:58 06/7/17 (4)
- It's the Law - Inmate51 18:55:38 06/7/17 (3)
- It's all Relative - Lew 10:53:05 06/8/17 (2)
- RE: It's all Relative - Inmate51 11:09:36 06/8/17 (1)
- If you're in the Northern temperate zone, like me,... - Lew 08:46:28 06/9/17 (0)