FR64s & Orsonic Av-1s Effective mass ?

Yes, I was thinking about on what You wrote about the B-60, offloading the vibration energy. An interresting theory. By the way I do not have the B-60, but the arm is drilled directly in the Debut plint.

The fr64 is an excellent arm. Raul has some strange opinions some times. I think he loves distortions😱

lewm "As I implied in one of my responses to Raul, I think the coupling of the tonearm (any tonearm, but maybe especially undamped tonearms) to high mass is another form of dampening."

I agree absolutely. When I had the FR-64S, it was on an Oracle Delphi Mk3 with a special metal armboard that sounded way better than the factory-standard acrylic board. That combo, on the FR adjustable VTA base, was just incredible. As I mentioned earlier in this thread, I sold the whole package to a friend who still uses it. And it still sounds great. The various Orsonic headshells were also a major improvement, and helped match the arm to the cartridge.

Dear @analogluvr :  Audio world must lives with distortions and yes I love distortions as you too but difference is what kind of distortions makes less harm to the MUSIC and to what is recorded in the LP grooves.

I'm sure that you love diferent kind of distortions than me as many of other audiophiles. That's the main subject.

Regards and enjoy the music,
R.

"FR adjustable VTA base" = B60, to which I referred.  Using it has the non-obvious advantage of adding mass to the arm by virtue of its close coupling to the vertical shaft of the arm proper.  To add even much more mass, I created an aluminum arm board that is in turn connected to a second massive piece of aluminum bolted to the bottom of the plinth, via a half-inch diameter bolt that joins the two.  So, from the headshell all the way to the mount, there is solid metal which should facilitate the transfer of energy away from the cartridge.  This could be just mental masturbation on my part, but it does sound good, and I hear none of the problems cited by Raul.  In fact, the outstanding characteristic of the sound is that it is very "clean", no evidence of a resonant signature in the treble or anywhere else. But I do take Raul's comments seriously, because he is a careful listener, albeit he listens to a system quite different from mine. (By the way, I too am using a light weight headshell; I think it's magnesium.  The cartridge right now is an Acutex with very high compliance; I was expecting the worst from this combo but got something great.)