Patent 9510086 was granted and assigned to Apple (company) on November, 2016 by the United States Patent and Trademark Office.
An earphone comprising an earphone housing having a body portion, the body portion having an acoustic output opening to output sound from a driver positioned therein into an ear of a user. An acoustic tuning member is positioned within the body portion. The acoustic tuning member defines a back volume chamber of the driver and includes an acoustic output port for outputting sound from the back volume chamber of the driver to improve an acoustic performance of the earphone.