Patent ID: 7813770

Claim:
A handheld electronic device, comprising: a casing; a print circuit board; and a speaker module coupled to the print circuit board within the casing, the speaker module comprising: a speaker unit; and a speaker box having a wall defining an aperture receiving the speaker unit therein, a first speaker chamber, a second speaker chamber, and a communicating channel positioned between the first speaker chamber and the second speaker chamber, wherein the first speaker chamber has a first opening defined at one end of the communication channel, and the second speaker chamber has a second opening defined at the other end of the communicating channel, wherein the first speaker chamber communicates with the second speaker chamber through the communicating channel, wherein the speaker unit, the first speaker chamber, the second speaker chamber, and the communicating channel form an only enclosed space within the speaker box, and wherein the aperture is the only one aperture to acoustically communicate the speaker box with outside thereby.