Abstract
The design, construction, calibration and performance of an impedance tube facility for precision measurement of both acoustic impedance and insertion loss of samples of acoustic material at high sound pressure levels is described. Over the frequency range 300–3250 Hz maximum sound pressure levels in the range 144–159 dB are achieved with maximum standing wave ratios in the range 44–53 dB. Higher sound pressure levels are possible at the expense of reduced fatigue life of the driver unit diaphragms. A complete discussion of the calibration and accuracy of the system is included. Also a brief description is provided of the “two microphone” method of impedance measurement, to which the facility is also adapted.
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