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Mass-air-mass resonance |
| (see Double wall resonance) |
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Mass-law sound transmission loss (dB) |
| The theoretical sound transmission loss of a homogeneous, limp panel. It depends only on the surface weight of the panel and does not take into account the resonances which result from stiffness, coincidence or air cavities. |
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Maximum sound level (Lm, dB) |
| This is the maximum sound level in decibels which is measured during the measurement period. This should not be confused with Speak sound levels. |
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Mitigation |
| The process of reducing sound to meet a selected criterion, usually through application of engineering or administrative controls. |
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Muffler |
| A device used to reduce the noise in piping or duct systems. It can also be a device at the end of a high-pressure pneumatic line. These are sometimes called silencers. |
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