Expenses for repairing and maintenance were reduced after the low frequency sound wave deashing device was used.

经采用低频声波清灰装置，减少了检修和维护的费用。

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The multiple degrees of freedom (MDOF) waveguide vibration suppressor has the capacity to absorb low frequency sound.

多自由度波导抑振器具有吸收低频入射声波的功能。

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This paper introduces how to establish Three-dimension finite element model to solute low frequency sound transfer function in small-enclosed room.

文中详细介绍了如何建立用于求解小尺度封闭空间低频声传递函数的三维有限元素模型。

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Such damage has long been suspected, since whales employ their own form of sonar for navigating and hunting, and also use sonar-like low frequency sound for communicating with each other (so-called whale song).

ECONOMIST: Quiet, please. Whales navigating

Because of the distance that low-frequency sound waves can travel under water, a set of four ships emitting sound at 235 decibels could monitor 80% of the world's oceans for submarines.

ECONOMIST: The American navy may soon have a whale of a problem

Furthermore, the LightSpeaker's 2.5-inch wide dispersion driver uses digital signal processing to optimize high- and low-frequency output for a full spectrum of sound.

ENGADGET: Klipsch LightSpeaker makes whole home audio as simple as screwing in a light bulb (hands-on)