![]() Yeah, I'm no expert myself, but the "effective" mass is not the weight of the tonearm, but rather the amount of mass and it's distribution or location on either side of the fulcrum (pivot point). One thing I’m not clear on is that I’ve heard it stated that the effective mass is only the mass forward of the pivot point of the arm, but then also heard other statements that suggest that what you do with counterweights can alter the effective mass, so want to clarify that. I just got a new turntable, and tried to work this out and i get a figure of 8.14, which is a touch on the low side, so not sure if that’s a problem (it doesn’t sound like there’s a problem). Too much mass for the compliance of the cartridge will push the resonant frequency down into the frequency of any record warps and too little mass for the compliance of the cartridge will push it up into the audible band. High compliance = loose suspension = more suitable for lighter arms low compliance = stiff suspension = need more mass. how springy the cantilever suspension is. I’m learning on this, but it’s to do with the inertia of the arm+headshell+cartridge (commonly referred to as ‘effective mass’) versus the compliance of the cartridge i.e. Can anyone explain the principles involved here. So, what controls the amplitude of the resonance? Also some carts will react over a wider range of frequencies, say 5-10 hz, while others have a much more narrow band say 10-11 hz. ![]() ![]() Even with the same arm, on some carts, the cartridge shell and arm will vibrate up and down wildly to the point of jumping out of the groove during the peak resonance frequency, while others show only a moderate vibration and others are very well controlled with the only visible vibration occurring in the cantilever. For forty years I've been using a test record to check the tonearm-cartridge resonance frequency. I have a question that been bugging me for years. ![]()
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