SADL- All subjects completed the Satisfaction with Amplification in Daily Living (SADL) questionnaire for each of the three aided conditions. The SADL was designed to quantify satisfaction with hearing aids. This scale consists of 15 items in four subscales: positive effects of amplification, service and costs, negative features, and personal image. Subjects respond to questions about their general opinions of wearing hearing aids. For the current study, the 3 questions on cost and service were omitted, because the subjects did not pay for the hearing aids, only wore the experimental hearing aids for one month before completing the survey.