Don’t forget, Alacrity Audio’s Acoustic Induction promotes the production of a Standing Resonant Wave, not at their own Resonant Frequency because they do not have one, but at EVERY frequency and complex wave-form with which they are driven, a previously demonstrated unattainable state for any enclosed or vented volume of air.
The easiest way to visualize what’s going on in those boxes is to imagine them as working like a coil (inductor), as opposed to all other loudspeaker cabinets which act more like a condenser (capacitor).
Under “d.c.” acoustic conditions, the bass unit reaches it’s maximum excursion boundary and sits there. Pressure (the applied signal) equalizes through the system and the acoustic resistance (flow of air) falls (stops), although an acoustic potential (‘back-EMF’) remains. When the d.c. condition is removed, the acoustic potential discharges in the opposite direction to the force that was previously applied, producing a classic cosine waveform.
This is the very definition of an acoustic inductor.
Under “a.c.” acoustic conditions, the bass unit must dissipate the acoustic back-EMF in the cabinet before it can change direction and complete the next part of the waveform. Fortunately, the direction of collapse for this wave…
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