What cart. for the Reed 3P?

Please correct me if I am wrong! As far as I understand, there is nothing special about this so call ideal resonance range of 8 - 12 Hz. It is just a general range to stay away from the lowest audio frequency (20Hz) and structural borne vibration (around 3 -6Hz), so these frequencies would not excite the arm/cartridge resonance.

So, if I have an arm/cartridge combo that resonate at 6Hz, but I have something like a Vibraplane, which block 90% of the vibration at 6Hz from reaching my TT, why should I worry as there is none / minimal energy at this frequency to excite my arm/cartridge. How would this affect the system's performance?

As far as I understand, other vibrations generated from within the system, such as warped or off centered LP, happen in much lower frenquency than 6Hz.

Dover, thank you for the information! My question is, if we can block all, or most, of the external vibration at that resonance frequency (6Hz in my previous example) from reaching the TT by a Vibraplane or somthing similar, would that still has any affect on the tracking ?

My way of thinking is that if there isn't any 6Hz vibration (as in my example) reaching the TT, then the arm/cartridge resonance will not be excited, and the tracking will not be affected. Is there anything wrong with my thinking? Thanks

Dover, thank you for your detailed reply!