TY - JOUR AU - Warnock, A.C.C. PY - 2004/09/01 Y2 - 2024/03/28 TI - Forward and reverse transmission loss measurements JF - Canadian Acoustics JA - Canadian Acoustics VL - 32 IS - 3 SE - Proceedings of the Acoustics Week in Canada DO - UR - https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1681 SP - 168-169 AB - The main methods for measuring sound transmission loss using the two-roo method ASTM E90<sup>1</sup> and ISO 140?3<sup>2</sup> 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 <sup>1,2</sup> 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. ER -