On the calibration of two commercially recorded versions of CID auditory test W-22

Electroacoustic analysis of two commercially available versions of CID W-22 indicated significant differences in calibration. Measured differences in level between calibration tone and stimulus words were plus 5 to 8 dB for Technisonic recordings and plus one dB for Auditec recordings. As a consequence, the Technisonic Studios recordings were approximately 40% more intelligible than were Auditec recordings when presented to normal-hearing listeners in a background of competing speech spectrum noise in a condition where the level of the calibration tone of the respective recordings was used as the reference value to specify nominal speech-to-noise ratio.