Tag Archives: regulations

Low Frequency Noise: Identification and Mitigation

Low frequency noise (LFN) is generally defined on the Common Octave Bands as 250 hertz (Hz) or less. You might know it better as that chest-rattling thump of the bass from a car driving past with its music cranked. You can’t really make out the song, but you can feel the beat in your chest. Or even as the pulse of the speakers at a concert that make you worry you’re having heart palpitations. In short, LFN is felt more than it is heard.

LFN is to the noise world what the marathon runner is to athletics; it has long wavelengths (31.5 Hz, for example, is almost 35 feet long), high endurance, and will travel long distances. Compared to the high-frequency sprinter, a sound wave at 8000 Hz is only 1.65 inches long. The higher the energy, the quicker it dissipates.

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Sound Waves

Sounds Waves is your quarterly source for the latest news and information on industrial noise control. The newsletter features relevant […]

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