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Welcome Licorice Pizza (LP) lovers! Setup guides and Vinyl FAQ.

RE: My point -

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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