- Mar 1, 2018
- Gold Coast, Queensland, Australia
No, both MC and MM cartridges are seismic type which basically means they start working accurately once the frequency gets high enough for the stator part of the cartridge, which is the bit in the headshell, is close enough to stationary with respect to the stylus, which happens from around 2x the natural frequency of the mass on the suspension.
At very low frequency the cartridge body and headshell move with the stylus - which is just as well otherwise it wouldn’t be able to track the record of course. As the frequency goes up towards resonance the same excitation is moving the headshell much more than the stylus then at resonance there is a 180 degree phase shift and the cartridge body amplitude starts to reduce until at around twice the natural frequency the headshell becomes acceptably close to static relative to the stylus and the system starts accurately transducing the signal.
Of course if the frequencies around resonance are not excited much it may not be a serious problem but fundamentally those low frequencies are spurious in amplitude and phase and good engineering practice is to simply filter them out. Then it doesn’t matter if they are excited or not to the downstream electronics.
Most important post ever in relation to vinyl playback, the issues and limitations with accurate LF reproduction.