EQUIVALENT THRESHOLD SOUND PRESSURE LEVELS FOR SENNHEISER HDA-200 EARPHONE AND ETYMOTIC RESEARCH ER-2 INSERT EARPHONE IN THE FREQUENCY-RANGE 125 HZ TO 16 KHZ

Equivalent Threshold Sound Pressure Levels (ETSPLs) have been determin ed for the Sennheiser HDA 200 earphone and the Etymotic Research ER-2 insert earphone. Thirty-one young normal-hearing test subjects partici pated and the thresholds were determined for all recommended frequenci es in the frequency range 125 Hz to 16 kHz. The results for the HDA 20 0 earphone are generally in very good agreement with the results from two other investigations which are available at present. Only at 6 kHz is a 9 dB deviation found and at 8 kHz a 6 dB deviation is found betw een the three investigations. For ER-2 it has not been possible to fin d other ETSPL determinations in the literature.