Raul, I think your patronizing attitude about others' knowledge on this and other subjects, is not appreciated, at least not by me. Mine is not a general recommendation. It is specific to Crazy Bill's two low compliance carts, and possibly a third, the Miyajima Zero. I admit the Zero recommendation is guesswork on my part. I think I stated as much on my initial post.
I don't think the FR64s and 66s are a good choice for general use and cartridge swapping as some other people might, but in this case, mated w/Rosewood or a modified 103, it can sound quite good. In certain circumstances the arm is prone to ringing, but this is not one of those circumstances IMO. Ringing can be alleviated by damping the arm tube. Having a replaceable headshell allows finding a synergistic combination and adjusting mass somewhat.
It was you who challenged my recommendation and started talking about ideal resonance range theory, yet you made no recommendation. Waiting for your arm to be introduced, or is that not imminent?
This forum happens to be in English. If you can't understand what's being said or can't express yourself so you can be understood, whose fault is it? You're obviously remedial in some of these tech subjects, but I don't think challenging others is a good strategy to learn.
Sincerely,