Calibration of Headphones and Earphone with KEMAR

In this paper, we explore calibrations for DT770 Pro, Sennheiser's HD250 headphone and Etymotic Research ER-2 insert earphone with KEMAR. The results have proved that at least for these three earphones, the change of earphone's location will cause the sound pressure level in the subject's tympanic membrane to change. However, only in the relative lowfrequency and high frequency regions, the changes of sound pressure level are relatively obvious. In other frequency regions, the changes of sound pressure level are relatively small. In addition, through the comparison of three earphones, we find that the ER-2 earphone has the best performance in the experiment.