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Re:How We Reverse Engineered the Cuban “Sonic Weapon” Attack... by jonny_eh on Thursday July 22, 2021 @02:30PM (#27922526)
From the article:

> We also found electronics stores that carry high- power ultrasonic jammers that cause microphones to malfunction

Re:How We Reverse Engineered the Cuban “Sonic Weapon” Attack... by gricardo99 on Thursday July 22, 2021 @02:49PM (#27922726)
and:

  If a signal from that caliber jammer were to combine with a second ultrasonic source, audible by-products could result.