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Abstract
Pure tone thresholds were obtained using a TDH-39 driver mounted in a standard (MX-41/AR) cushion and an Auraldome (AR-100-R) circumaural enclosure. Thresholds were recorded in quiet and in the presence of broad band sound field noise at 50, 60, and 70 dB SPL. No significant differences were observed between the two earphone conditions in the presence of any of the ambient broad band noise levels. However, thresholds were found to be statistically different in the quiet condition. These results raise questions regarding the calibration of intensity for Auraldomes and indicate that this particular circumaural cushion provides no advantage over standard cushions in the presence of ambient noise above 50 dB SPL