Patent ID: 8401215
Filing Date: 2013-03-19
Classification: H04R

Abstract:
1. A receiver comprising; a balanced armature motor which is mechanically interconnected to a displaceable diaphragm component; a front volume, wherein the front volume changes as the displaceable diaphragm component moves and wherein the front volume is connected to a port; a rear volume, wherein the rear volume changes oppositely to the front volume as the displaceable diaphragm moves; an internal volume, which is a combination of the front volume and the rear volume and wherein the internal volume is bounded by a housing having at least one wall; an acoustic channel which connects to the port and is also connected to a sound outlet and wherein the acoustic channel is not part of the internal volume; wherein the sound outlet allows acoustic energy to exit from the acoustic channel; a first acoustic pressure being generated in the front volume as the balanced armature motor moves the diaphragm; wherein the acoustic channel and the internal volume are divided by a common wall section, wherein the common wall section is defined by at least one of the walls of the housing which also provides a portion of at least one wall for the acoustic channel; wherein a portion of the acoustic channel along the common wall section has an acoustic mass greater than 4000 kg/m^4.