An acoustic system (100) includes a resonant cavity (106) that enhances an audio sound pressure signal produced by a transducer (102) and provides the enhanced audio sound pressure signal to a diffuser cavity (110) and an acoustic cover (120) to diffuse the sound pressure output signal across a greater area to facilitate properly placing the acoustic system (100) to a user's ear. Incorporation of the acoustic system (100) into a portable electronic device, such as a cellular telephone, provides an acoustically optimized and physically small audio generator that is easily located along a user's ear.