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1. Low Frequency Acoustic Vibration

   Linked via "phase-shifted wave"

   Due to the low impedance of air at these frequencies, conventional soundproofing techniques (mass-based absorption) are largely ineffective against LFAV transmission. Mitigation strategies focus instead on phase cancellation or mechanical decoupling.
   Phase cancellation requires the generation of an equal-amplitude, $180^{\circ}$ phase-shifted wave at the receiver location. This is achieved using complex, multi-speaker arrays known as **[Infrasonic Nullification Emitters (INEs)…