Cartridge ISOLATION; What Say You?

lewm, now I know it's Lew M

That was funny, give my apologies to the wife.

It’s about Jitter getting into the tonearm and back into the cartridge isn’t it?

It’s about less rigid fastening of the cartridge body, no matter how thin, to the arm isn’t it? This UGLY thing is quite thick.

And, the reviewer (not the isolator’s maker) mentioned a less rigid fastening of the tonearm base to the plinth, a double whammy of some, even if infinitesimal, movement.

Jitter into/back out of the arm, if acknowledged, is unwanted movement, sooooo, isolate from jitter? a speck of isolation (movement) reduces the jitter going/thus reduces the jitter feedback?

That's what makes the Strain-Gauge, supposedly essentially Jitter Free so tempting to me.

By Jove I think he's got it!  

Sounds like you've been watching Ledermann and know the importance of lowering moving mass. Soundsmith MI carts have much lower moving mass than MC, and strain gauge has even less moving mass than MI. This is huge, and has a lot to do with the outstanding performance. If you read the reviews SG1 is cost no object performance for what works out to be quite reasonably attainable cost.  

This still leaves the question of cartridge vibration control. Always prefer vibration control as more precise than isolation. There is no true isolation ever, but we can tune frequency and amplitude, and this is vibration control. 

With the cartridge we want some combination of materials structured so as to hold the cartridge firmly in a fixed relationship to the head shell, and yet at the same time have just enough flexibility on a micro level to dissipate cartridge vibration and not reflect it all right back down into the stylus.   

MC, It's interesting that you quote Isaac Newton's laws, call people "Einstein" as a form of sarcastic insult to indicate he or she is not brilliant, and use a famous photo of Einstein as your icon.  Yet it was Einstein who displaced Newton's Laws with his Theory of Relativity. Go figure.

Will do @dinov

So many interesting points.

Question, is it not the job of the cantilever to function as suspension along with transferring the vibrations to the motor of the cartridge?

In which case, shouldnt it be the only thing that is vibrating/moving?

If the cartridge is also suspended, would that not remove the accuracy/immediacy/directness of the transfer of energy - as the place where that energy should go, would be damped. In being damped, seems like the energy transfer would be reduced.