Acoustic Wall Treatments

Tectum Inc

Newark, 美国 中的 商业制造与供应
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Tectum has been providing acoustical solutions in the commercial and institutional construction industries for more than 50 years.

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What is NRC?
答:
NRC means Noise Reduction Coefficient. It is the average sound absorption coefficient measured at four frequencies: 250, 500, 1,000, and 2,000 Hz expressed to...
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