Cartridge Impedance

You've got three electrical parameters going on here to consider: Impedance (which depends on frequency), capacitance (from the phono cable to the preamp), and inductance from the MC coils. 

The combination effectively forms a broad band-pass filter. 

You indicate you can adjust the impedance that's basically like a slider on an graphic equalizer with a very wide band.

You can probably just tweak it so that it sounds "good".

To be more precise you would need a calibration record and adjust the impedance setting until you get a more-or-less flat frequency response sweep but that requires more equipment and time and effort that you're likely to want to do. 

Keep in mind that your phono preamp stage also applies RIAA equalization.

Dear friends. If what atmasphere posted: """  the cantilever to do more work and makes it stiffer, less able to track higher frequencies.  """

if that theory is a proved reality then it's welcomed because what a cartridge designer is looking ( between other characteristics. ) is that for cantilevers build materials on choice  its Young Modulus value be the higher  one and that's why the first/main choices are diamond and Boron over any other cantilever build materials that have the higher YM values.


""" Young's Modulus alt. Modulus of Elasticity - is a measure of stiffness of an elastic material. It is used to describe the elastic properties of objects like wires, rods or ...... """

So it's not wrong as he always says but at the end I never seen a white paper that proved that theory and again if already proved then welcomed !.

R. 

Dear @lewm  @terry9   :   """  Impedance (which depends on frequency), capacitance (from the phono cable to the preamp), and inductance from the MC coils.  The combination effectively forms a broad band-pass filter. """

that's was posted anthonymaw and this is what I posted on the regards:

"""  What normally happens is that in some phono stages when load impedance is changed exist/developed an electrical circuit between the phono stage: inductance, impedance and cartridge inductance and even capacitance and whom react to load impedance in reality is not the LOMC but the phono stage performance. ""

that's " a broad band-pass filter ".


R.




   

Just to be more pedantic so as to possibly annoy the OP, "impedance" is DUE to the inductance and capacitance coupled with the resistances.  If there were no reactive components, i.e., capacitance and inductance, then one would only have to deal with "resistance" which is by definition a constant at all frequencies (although in real life, resistors, some types more than other types, have minor properties of capacitance and inductance, at extreme frequencies).

Poor English is something up with which I shall not put! Ha! 
Your pedantry is beyond my annoyance. But I thought your post was cute.