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What will the attenuation in dB outdoors due to a barriers 1.8m above the acoustical line of sight and 3.0m from a sound source at 500HZ. Assume the receiver is a distance much greater than 30m from the barrier



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What will the attenuation in dB outdoors due to a barriers 1.8m above the acoustical line of sight and 3.0m from a sound source at 500HZ. Assume the receiver is a distance much greater than 30m from the barrier

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