I was doing some reading about alterniative theory for tonearm resonance here. Stated that vertical should actually be between 15-20hz, and horizontal at really low freq. like 3-6hz. Would love to hear some comments on that as I may add a new cart and be right around 8 using a 28cu high compliance moving iron with 1g VTF.
This is a needledrop of the Ultimate Test Record. Grado Ref. on MG1 airbearing, and I'm curious if the 20-30hz rise in amplitude is by nature of a resonance or not. It is cut at -20db so I'm guessing this is a resonance. At 10hz, where I had calculated the vertical resonance to be, is an expected hump where I can see the cart. shake visibly. I will add fluid damping to test the same track soon. I have an air ballast tank but I also notice that some air is actually impacting the vinyl itself on edge and making noise which I had not noticed in my last setup. Just curious as I use a digital rumble filter and hopefully the damping will help.
This is a needledrop of the Ultimate Test Record. Grado Ref. on MG1 airbearing, and I'm curious if the 20-30hz rise in amplitude is by nature of a resonance or not. It is cut at -20db so I'm guessing this is a resonance. At 10hz, where I had calculated the vertical resonance to be, is an expected hump where I can see the cart. shake visibly. I will add fluid damping to test the same track soon. I have an air ballast tank but I also notice that some air is actually impacting the vinyl itself on edge and making noise which I had not noticed in my last setup. Just curious as I use a digital rumble filter and hopefully the damping will help.

