Methods and apparatus to improve bass response of speakers in portable devices

Abstract

Methods and apparatus to improve bass response of speakers in portable devices are disclosed. An example speaker includes a speaker box having a front face and a back face, a distance between the front face and the back face being less than 1 inch. The speaker box has a first portion of a back volume and a second portion of the back volume, the first portion of the back volume defined between the back face and a first region of the front face, the second portion of the back volume defined between the back face a second region of the front face. The example speaker further includes an active speaker driver including a first diaphragm, the first diaphragm coupled to the first region of the front face. The example speaker also includes a second diaphragm coupled to the second region of the front face, the second diaphragm being passive.

Dependencies are inferred from the claim text.