Patent ID: 8320597

Claim:
An accessory for a portable electronic device having a speaker, said accessory comprising: a rectangular, box-shaped housing having a docking cavity formed in an upper face of an exterior wherein the docking cavity has supportive sidewalls that are adapted to receive and support the portable electronic device in an upright position; a cable access channel formed in the docking cavity that allows a connector and cable to be coupled to the portable electronic device when the portable electronic device is mounted in the docking cavity; and an acoustic waveguide having a spiral shaped acoustic chamber positioned in the rectangular, box-shaped housing such that an entrance to the acoustic waveguide corresponds to a hole in the docking cavity that is positioned to correspond to the location of the speaker of the device when the device is mounted in the docking cavity; wherein a perpendicular cross sectional area of said acoustic chamber increases approximately exponentially from the acoustic chamber entrance to the acoustic chamber exit; and wherein an exit of said acoustic waveguide is substantially the same size as an exterior face of said rectangular, box-shaped housing on which said exit is positioned.