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RE: "However, nearly all MM cartridges have bandwidths less than 25-kHz...." Again?




The mechanical resonance of many designs does permit a response to extend well past 25kHz before the cutoff is reached. Ignoring low impedance MM designs like Stanton/Pickering's XLZ/LZS models, CD4 replay was all done with MM cartridges back in the day. The key being that the load resistance was set at 100k in order to utilise the mechanical resonance peak to be able to get a good response of the carrier at 30kHz.

However, even into the "standard" load, the replay response of the Stanton CS100 quotes confidence limits of ±1dB between 20Hz to 20kHz and they claim a response out to 50kHz. The inductance for this cartridge is 270mH which puts the electrical resonance at around 18.5kHz into a standard 47k load, with 275pF.

My best example to use would be a Stanton 681 which has an inductance of 930mH which would gives an electrical resonance of 10kHz. The damping factor of this design is somewhat higher at 0.62 than the usual 0.5 or less of most common designs. However, the response extends past 25kHz to 29kHz (on the vertical modulation test track) on this particularly poor sample of a EEEMkIII stylus which was way out of spec for compliance - I suspect this may have been a DJ stylus with the wrong labelling based on the VTF required to get acceptable tracking!
Regards Anthony

"Beauty is Truth, Truth Beauty.." Keats

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