What Is STC?

- Oct 29, 2018-

   Sound Transmission Class (STC) is a rating assigned to a material or an assembly of materials representing the transmission loss or reduction in sound between the source and the target.  A standardized test, performed in an acoustics lab, measures the transmission loss between a Sound Source and a room.  Measurements are taken over a range of 6 different frequencies ranging between 125Hz and 4000Hz.  This frequency band covers the speech range.

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