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@elfin
it's a good question

a few things:

the 'speaker' is an electro-motive piston

so, -of course- there are mass ratios at play

there are hacks tho:

multi-source utrasonic hetrodyning.

utrasonic transducers, -duh-, much lower mass, & highly directional,
intersection of multiple utrasonic 'beams' can be 'tuned' via beat freq interference to pull much lower freq 'sound waves', at pretty respectable SPL

I think that's where I'd dig in

phase array