Carpet and a pad even the heaviest pad available cannot block noise from loud kids stereo tv noise floor to floor noise from bars restaurants and commercial tenants. Indoor carpet has three main types of carpet constructions from which to choose based on your needs and style. The sound absorption coefficient can be measured by a standing wave tube impedance tube and the process is schematically shown in figure 10 2 the waves incident wave p i from the speaker transmit as plane waves in the tube the waves reflect wave p r reflect the material surface and the speaker repeatedly and a standing wave field is established in the tube 4.
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