Abstract
The special earphone described earlier (five driver units in a circumaural enclosure) has been used to determine hearing threshold levels of from 1 to 16 kc/sec for 3–6 subjects. Changes in driver voltage at hearing threshold and ear-canal pressure response levels with repeated measurements may be related to three mechanisms. (1) Changes in earphone-ear coupling account for most of the apparent changes in hearing threshold above 4 kc/sec (e.g., standard deviation 5 dB at 8 kc/sec). (2) Apparent changes in earphone response are attributed to probe-tube position errors at certain frequencies (5 and 10 kc/sec). (3) Threshold changes attributable to the subject average 2 dB at all frequencies with a 5–15-day interval between measurements.
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