Acoustic high-pass:
Fs – Free air resonance of a driver
Qts – Bandwidth of driver resonance
Fs and Qts can be obtained by manufacturer Thiele-Small specs or derived by an impedance chart if available:
Acoustic low-pass:
Determined by things such as motor force, suspension, and (namely) inductance.
If the inductance (essentially resistance to current, for our purposes) is high, the output of the speaker is less, regardless of the axis.
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