By the way Tony, I do recall matching up my arm/cartridge and the calculator predicted resonance was around 12Hz and using a test record, the tonearm went into oscillations around 16Hz. Close but not exact. So I do think it can vary and tolerances may be just a hair off here and there which may skew results or perhaps the test record was off, who knows... I never noticed any anomalies in the bass at that time anyway.
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