I'm certain that you think any vibration is resonance.
Resonance also means different things in different situations.
In Electronics, the Resonant Frequency is where the Capacitance & Inductance are matched in a way that produces the most signal, hence the Resonant Peak:
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It's counterintuitive with an electric bass, where an instrument vibrating at its resonant frequency is actually soaking up energy from the string vibration & dampening the output.
Maybe we get lucky & the instrument's resonant frequency is outside the range of the notes it produces!
You're confounding Resonance & Vibration, if it's resonating it's doing the opposite of spiking.
It's all too often that the ad-copy for a piece of gear is 'hyped up' with incorrect assertions.
Just last week I was reading a description for an instrument with Nordstrand Big Split pickups where the author wrote that the pickups are 'coil-tappable'.
There's two things incorrect about that, firstly: we don't coil-'tap' humbuckers, we coil-split them
This is a coil-tap:
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It's done with single-coils, where you TAP into the center of the coil. This is not applicable to humbuckers.
Secondly: You cannot coil-split a split-coil humbucker like the Big Split, because then only half the strings would produce a signal