Fig. 1.

Measured admittance magnitude (top panel) and phase (bottom panel) for the foam tip with no-leak (solid line) and for the modified foam tip with a 0.04-in. leak (dashed line) in the ear canal of one participant. The modified tip with the air leak has smaller admittance magnitude in the low frequencies where the leak susceptance cancels the ear-canal susceptance. The bottom panel shows how the phase goes to zero at the air-leak resonance frequency and is reduced at all frequencies below 1 kHz. A color version is available online.