Re what Raul said about my experience mating an Acutex LPM320 with compliance = 42, per factory literature, with FR64S using Dynavector headshell which is a bit lighter than a stock FR headshell, it's fantastic, and I hear no bass rumble which you might expect with such a low resonant frequency based on the math. However, the system is on a poured concrete floor in my basement, and the turntable (TT101) is resting on a large slab of very dense styrofoam used for shipping heavy yet delicate objects. (Better than any "audiophile" shelf, IMO.) Plus the tonearm mount board is custom made from about 5 lbs of aluminum and heavily damped, plus the FR64S is sitting in a B60 base that also adds mass. Perhaps this is why I don't have an issue. Add to this the fact that the quoted compliance of 42 is probably referenced to 100Hz; so it would be much lower at 10Hz. And add to that the age of my NOS Acutex which may serve to lower compliance due to stiffening of the suspension. This combo is sounding right now to be very slightly superior to a brand new Audio Technica ART7, running next door on a highly tweaked Lenco with a Dynavector tonearm, into the same downstream system.
I agree with Raul's point that the resonant frequency of the system might not be so important at frequencies well above resonance, which includes all of the music. Unless resonance is excited.
