Abstract: Audio ear buds preferably include a housing, an ear tip, an audio speaker, a chamber divider and a power line. The housing preferably includes a driver cup and a chamber cup. The ear tip is attached to the driver cup. A speaker cavity is formed in the driver cup. The speaker cavity is sized to receive the audio speaker. The driver cup is inserted into the chamber cup. The chamber cup includes a divider bore and an acoustic cavity bore, which are sized to receive the chamber divider. A sound hole is formed through a wall of the chamber cup into the acoustic cavity bore. The chamber divider includes at least one air passage hole. The chamber divider creates a ported speaker chamber and an acoustic chamber. The chamber divider acts as a passive resonator. The power line supplies power to the audio speaker.