The national park of Koli in eastern Finland is home to a famous, 34-metre-long crevice cave known as Pirunkirkko, or Devil's Church in English. A new study investigates the acoustics of the Devil's ...

Flow-induced acoustic resonance in ducted systems is a phenomenon where the interaction between fluid flow and the geometric features of ducts gives rise to self-sustained oscillations of sound. This ...

The entrance to the cave is only 1 m × 1.3 m in area, bordered by upward and downward bulging boulders. A roundish stone acts as a threshold above which one must bend to crawl. The first outer ...

Fractal Antenna Systems has introduced Acoustic Resonance Mitigation (ARM), a technology that disables drones using directed acoustic energy. ARM emits sonic, ultrasonic, and subsonic waves to induce ...

Inertial Labs has integrated the FT Technologies FT743-D-SM Acoustic Resonance air speed sensor into its inertial navigation systems (INS). This integration aims to improve the accuracy of horizontal ...

In a 2003 interview, drummer Peter Erskine spoke about playing in concert halls with such inherently good acoustics that PA systems were unnecessary. "audiences love it, they absolutely love it. The ...

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