TY - JOUR AU - Guy, R.W. AU - Li, J. PY - 1991/09/01 Y2 - 2024/03/29 TI - Suggestions for change to ISO 9614 JF - Canadian Acoustics JA - Canadian Acoustics VL - 19 IS - 4 SE - Proceedings of the Acoustics Week in Canada DO - UR - https://jcaa.caa-aca.ca/index.php/jcaa/article/view/671 SP - 61-62 AB - A Sound power measurement within a small semi anechoic chamber was undertaken in accordance with ISO Draft Standard 9614 employing a pressure-pressure finite difference probe system with real time band analysis. It was found that F<sub>2</sub>, designed as an overall surface pressure-intensity indicator, was negative in a particular low frequency band. This result was inconsistent to it's ultimate use within a qualification criterion and in consequence an investigation into the cause was undertaken ER -