Apparatus with wideband earpiece response

A method comprising:

• providing a housing comprising an earpiece aperture for radiating sound to a user's ear when an apparatus is located adjacent the user's ear;
• providing an earpiece speaker module within the housing and comprising an air displacement component that is configured to move upon application of an electrical signal for providing sound, the earpiece speaker module having a front surface and a back surface, within the housing, wherein sound waves propagate from both surfaces for providing the sound as acoustic signals to the user's ear when the earpiece speaker module is located adjacent the user's ear, and wherein the earpiece aperture is coupled to the earpiece speaker module by an acoustic channel between the back surface of the earpiece speaker module and the earpiece aperture;
• providing a front volume adjacent the front surface of the earpiece speaker module and coupled to an interior of the housing via a coupling channel;
• providing a substrate, comprising a first surface oppositely disposed to a second surface, within the housing such that the first surface of the substrate faces generally towards the earpiece aperture, such that the second surface of the substrate faces the back surface of the earpiece speaker module, and such that a rear volume is provided between the second surface of the substrate and the back surface of the earpiece speaker module;
• defining an acoustic cavity within the housing, the acoustic cavity being connected to the earpiece aperture, wherein the rear volume and the acoustic cavity are isolated from the front volume, and wherein the earpiece aperture is acoustically coupled to the rear volume by an acoustic channel formed between the rear volume and the earpiece aperture for radiating sound to the user's ear when the sound is generated by the earpiece speaker module;
• providing a second coupling channel to couple the acoustic cavity to the rear volume;
• and
• isolating the rear volume and the acoustic cavity from the front volume;
• wherein the substrate comprises a printed wire board, and further comprising electrically coupling the earpiece speaker module to the printed wire board;
• wherein the apparatus comprises a display panel comprising a display surface and a back surface, and wherein the back surface of the display panel faces the first surface of the substrate;
• and
• wherein the coupling of the acoustic cavity to the rear volume is used to control at least one parameter that affects a frequency response of the apparatus.