With loudspeakers, an important parameter is the frequency at which their cones resonate. This clever Arduino-based tester ...

Researchers describe an acoustic meta-surface that uses pingpong balls, with small holes punctured in each, as Helmholtz resonators to create inexpensive but effective low-frequency sound insulation.

Piezoelectrical materials are utilized in various applications, from biomedical (cardiac, auditory, ultrasound, and numerous biosensors) to advanced electronics—including energy production and storage ...