There's a well-known children's ditty
where animals try to find out who took the cookie from the cookie jar. Accusations and denials are exchanged, each round ending with "Not me! Then who?"
This ditty was stuck in my head as I was trying to understand the low-frequency behaviour of tonearms and cartridges. The difference in tracking ability is obvious and huge. But if the low-frequency resonance is not the culprit, then who?
I might have an idea.