What Does a Cartridge Compliance/Tonearm Mass Mismatch Sound Like?

Dear @lewm : Resonance frequency is an important parameter to take in count in the cartridge/tonearm combinations however and at other priority levels is the self cartridge tracking habilities, the kind of design and materials used in its suspension and how well the cartridge designer damped it overall.

The Acutex is a champ on that critical cartridge design target: very high tracking abilities and this characteristic makes a difference on the thread's subject.
Btw, that Acutex cartridge sounds good no matters wich tonearm we are using but if it's matched with better tonearm its quality performance level can goes higher.

Regards and enjoy the music,
R.

Dear @moonglum : """  can appear to split into 2 separate voices one in each channel! """

Could you tell us with what cartridge/tonearm combination and LPs experienced that specific situation?

Regards and enjoy the music,
R. 

stringreen, maybe you should have responded to Dodge using Viper in your example instead of Porsche.

Oh wait, doesn't that already have a truck engine? ;^)

Thanks, gents. Is it correct to say that there are different DEGREES of mismatch which might manifest differently? What I am hearing is low frequency rumble/distortion that is inaudible unless the volume is cranked up. Interestingly, the rumble/distortion exists during quiet/silent passages so this does not appear to be external vibrations from high SPLs disturbing the table, which is well isolated. I checked and the cartridge setup appears correct (overhang, VTF, etc) so it does not appear related to this either. Could there be a slight mismatch that is only audible when the volume control is aggressively amplifying the tonearm resonance? This is a buddies set up (Systemdeck II with a Rega arm and Goldring Eroica) which SHOULD be an OK match. Unfortunately, he lives quite a ways from me so I'm not able to do a lot of listening and intervention but thought I would get some opinions in an effort to help him out.