Tz...that's an interesting one. TBH I don't remember actually using the HFN/RR Test Disc to check H&V resonance in Real Time but have had no issues whatsoever with any disc and I'm about halfway through the life of the cart. My last cartridge, which was used on a 13g Linn Ittok LVII, wasn't so blessed and unfortunately turned out to be sensitive to "pinchwarps"....
The Phantom's bearing does have a damping trough which allows some tuning but the Phantom is reasonably well damped even if you didn't use it.
After initially installing I subjected the Lyra (Delos) to my "nightmare-disc-from-hell" and it sailed through it with flying colours - as if tracking by lasers. After that I ceased worrying :)
I would describe the general behaviour of arm/cart as imperturbable or rock solid.
All the best,
The Phantom's bearing does have a damping trough which allows some tuning but the Phantom is reasonably well damped even if you didn't use it.
After initially installing I subjected the Lyra (Delos) to my "nightmare-disc-from-hell" and it sailed through it with flying colours - as if tracking by lasers. After that I ceased worrying :)
I would describe the general behaviour of arm/cart as imperturbable or rock solid.
All the best,