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acoustical site assessment, barrier or berm is constructed to reduce the noise levels from the rock crusher to . Under the decibel scale, a doubling of sound energy corresponds to a 3 dBA .Psychoacoustic Evaluation of Rock Crushing Plant Noise, The noise of a rock crushing station was evaluated from psychoacoustics point of . Table II. The periodic components of the signal below. 200 Hz. f [Hz]. Lp [dB]..
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