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Mono "Bass" on Vinyl - Definition in Hertz?

Hey,

What is the definition of "bass" that needs to be mono for vinyl?

I'm seeing different numbers -- below 125 Hz, 150 Hz, 300 Hz, 400 Hz?

Is there any official definition?

Does it depend on what the bass is doing? Traditional "stereo image" versus actively bouncing around? Fairly compressed level versus punchy amplitude changes?