Turntable matching to MC or MM cart.

Mijo, What I was trying to say is that there is more to matching cartridges with tonearms than just concern about compliance and effective mass, and therefore the resonant frequency calculation.  I have found that some cartridges just come more alive in some tonearms (or in some headshells, where the tonearm has a detachable headshell).  Sometimes the best match for pure SQ is not the best match for resonant frequency.  I think this is in part because the values we plug into the equation for resonant frequency are often inaccurate.  For example, somewhere up the thread, someone mentioned that he calculated an Fr of 10 or 11Hz.  Then when he determined Fr using the HFNRR test LP, the result was 7Hz.  That actually suggests a big discrepancy between the assumed values of M and C and their actual values.

There is no need whatsoever to match turntable and cartridge.  Matching tonearms and cartridges is worth doing and requires experimentation, which is why some of us crazies own so many tonearms. Where the tonearm(s) use a detachable headshell, having a lot of different headshells, constructed of different materials and of different weights, is also handy for getting the most out of a cartridge.  This is not purely about achieving some magical resonant frequency, in fact that is a very secondary consideration in my experience.