Testing- All subjects will receive the same clinical and WB test battery. Each subject will be tested in one laboratory visit. Subjects will be enrolled in this study that upon otoscopic inspection of their ear canals, have no active drainage from the ears, and have ear canals free of cerumen (wax) impaction, bilaterally. Subjects who are found to have draining ears or cerumen impaction will be referred for treatment. These individuals may be enrolled in the study following successful treatment for their conditions. All subjects will have a standard pure-tone air- and bone-conduction audiogram while comfortably seated in a sound-treated booth. Standard insert earphones and a bone-conduction vibrator will be used to present the sound stimuli. Next, speech audiometry will be completed and the speech reception thresholds, uncomfortable loudness test for speech, and speech recognition scores will be obtained. Then the subjects will have a standard immittance test battery consisting of a tympanogram and acoustic reflex threshold testing. Stimuli will not exceed a level of 100 decibels hearing level (dB HL). Finally, the wideband test battery will be performed with adults seated comfortably in a sound-treated booth. A small probe with a soft rubber tip will be inserted in the subject's ear canal, and the subject will be asked to remain quiet while sounds are presented to an ear via sound sources within the probe. Responses will be measured using a miniature microphone within the probe. The tests in the wideband battery are similar to the clinical admittance battery and include ambient absorbance, absorbance tympanometry and acoustic reflex threshold. The otoacoustic emission testing is a separate measurement of inner ear function typically conducted in the clinic using different equipment.