Hearing aid volume control taper: Kasten and Lotterman revisited

In 3 mild, 3 moderate, and 3 high gain aids the gain provided (ave. of .5, 1, and 2 kc/s) was determined as a function of volume control rotation. In the time since the study by Kasten and Lotterman (J. Aud. Res., 1969, 19, 35-39) there appears to have been an improvement in the linearity of the VC taper characteristics for the high gain aids (greater than or equal to 50 db). The mild and moderate gain aids still do not show a linear increase in gain.