Forward and reverse transmission loss measurements

A.C.C. Warnock


The main methods for measuring sound transmission loss using the two-roo method ASTM E901 and ISO 140∓32 are discussed. Changing the direction of a transmission loss test leads to a change in the STC and other ratings generated. The standard test methods 1,2 require measurements in both directions as a means of improving reproducibility for the test methods. The number of microphone position required for a test in a direction can be reduced to avoid doubling the time for testing.


Approximation theory; Automation; Calibration; Data acquisition; Frequencies; Microphones; Standards; Automated systems; Floor plan; Mean difference; Transmission loss

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