The crossover building video:
   • Making The Crossovers For My Speakers...  

Another thing about this coupling between coils is that no filter is 100% effective - it's a slope, so there's already some low frequency signal going to the tweeter and high going to the woofer, but at a MUCH lower volume.
My scope was set to 5mV per division, so the coupling when the coils are spaced as I did in my crossover is around 5mv peak to peak.
And yes, this would go up as the volume goes up, but so would the regular music output from the speaker.

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