That calculator can be incorrect because there is a lot of variance involved. It is always best to measure the resonance frequency directly with a test record. As @lewm suggests 7 Hz is not all that bad. It is better to be lower than higher. If your cartridge is tracking well and tolerates warps OK then you are fine and I would not worry about it. As the resonance frequency gets too low warps can send the tonearm airborne.
High Compliance Cartridge With Low/Med Mass Tone Arm
I am using an Art 9xi with a SL 1200G turntable.
Dyn Compliance on the cartridge is 25 after converting from
the Japanese standard. Tonearm mass with stock headshell is 12 grams.
The stock headshell is the lightest I can find.
Using the Vinyl Engine Cartridge Resonance Evaluator, the
resonant frequency comes in at the middle of the 7Hz yellow area.
I know this is not Ideal.
Question: what should I be listening for to determine if this is not
a good match? What negative sound characteristics would be
apparent?
Thanks for any input.