A portable electronic device, comprising: a housing for the portable electronic device, the housing including a shared audio output port in a wall of the housing; a first audio chamber internal to the housing and having a first exit opening proximate to the shared audio output port, the first exit opening having a first size; a second audio chamber internal to the housing and having a tapered region defined by nonparallel opposing side walls at a first end, and a non-tapered region defined by parallel opposing side walls that at least partially define a second exit opening proximate to the shared audio output port, the second exit opening having a second size; a first speaker driver provided in or coupled to the first audio chamber and configured to produce audio output in a first direction that is parallel to the wall of the housing; and a second speaker driver provided in or coupled to the second audio chamber at the first end of the second audio chamber and configured to produce audio output in the first direction, wherein the second audio chamber is provided adjacent to the first audio chamber within the housing, such that the first audio chamber and the second audio chamber share the shared audio output port in the wall of the housing; wherein the first audio chamber and the second audio chamber direct the audio output from the first speaker driver and the second speaker driver, respectively, to the shared audio output port by directing the audio output in a second direction that is perpendicular to the wall of the housing; wherein the first audio chamber and the second audio chamber are separated by a shared internal barrier provided internal to the housing; wherein the shared internal barrier acoustically separates the first audio chamber and the second audio chamber, yet participates in directing audio output from the first audio chamber to the shared audio output port and directing audio output from the second audio chamber to the shared audio output port; wherein the tapered region of the second audio chamber is defined in part by a side wall, wherein the side wall is arranged to direct the audio output from the second audio chamber by constricting the second audio chamber; and wherein a size of the shared audio output port is equal to the first size of the first exit opening combined with the second size of the second exit opening. a housing for the portable electronic device, the housing including a shared audio output port in a wall of the housing; a first audio chamber internal to the housing and having a first exit opening proximate to the shared audio output port, the first exit opening having a first size; a second audio chamber internal to the housing and having a tapered region defined by nonparallel opposing side walls at a first end, and a non-tapered region defined by parallel opposing side walls that at least partially define a second exit opening proximate to the shared audio output port, the second exit opening having a second size; a first speaker driver provided in or coupled to the first audio chamber and configured to produce audio output in a first direction that is parallel to the wall of the housing; and a second speaker driver provided in or coupled to the second audio chamber at the first end of the second audio chamber and configured to produce audio output in the first direction, wherein the second audio chamber is provided adjacent to the first audio chamber within the housing, such that the first audio chamber and the second audio chamber share the shared audio output port in the wall of the housing; wherein the first audio chamber and the second audio chamber direct the audio output from the first speaker driver and the second speaker driver, respectively, to the shared audio output port by directing the audio output in a second direction that is perpendicular to the wall of the housing; wherein the first audio chamber and the second audio chamber are separated by a shared internal barrier provided internal to the housing; wherein the shared internal barrier acoustically separates the first audio chamber and the second audio chamber, yet participates in directing audio output from the first audio chamber to the shared audio output port and directing audio output from the second audio chamber to the shared audio output port; wherein the tapered region of the second audio chamber is defined in part by a side wall, wherein the side wall is arranged to direct the audio output from the second audio chamber by constricting the second audio chamber; and wherein a size of the shared audio output port is equal to the first size of the first exit opening combined with the second size of the second exit opening.