Abstract: A speaker includes a magnet having a wedge-shape, so the magnet has different widths at different locations. One or more voice coils are coupled to a diaphragm that is proximate to the magnet. As the magnet has different widths at different locations, different locations of the magnet provide a different magnetic field strength. To compensate for variances in movement of the diaphragm from the varying magnetic field strength of the magnet, a surround coupled to the diaphragm has an asymmetric stiffness. The surround has a higher stiffness proximate to locations of the magnet where the magnetic field is stronger and a lower stiffness proximate to locations of the magnet where the magnetic field is weaker.

Abstract: A display device may include (i) a display panel, (ii) a housing surrounding at least a portion of the display panel, (iii) an audio trench peripherally surrounding at least a portion of the display panel, the audio trench including a trench opening in a front side of the housing between a frame region and a peripheral region, and (iv) at least one speaker driver disposed between the display panel and a back side of the housing, the at least one speaker driver including a sound radiating surface positioned to direct sound waves into an acoustic chamber defined between the at least one speaker driver and the display panel, wherein a chamber opening is located between a lateral periphery of the acoustic chamber and the audio trench. Various other systems, devices, assemblies, and methods are also disclosed.

Abstract: The invention relates to a method of managing acoustic feedback in a hearing aid, characterised by using a multi (two or more) channel type of filter hereby splitting the frequency range up in two or more separate parts; determining the maximum allowable gain in at least one frequency range before feedback occurs; monitoring the volume control in such a way, that if the maximum allowable gain before feedback occurs is reached, the gain is manipulated for the offending frequency range. The determination of maximum allowable gain and the monitoring of the volume control is applied for several channels. The invention further relates to hearing aid implementing the method according to the method according to the invention.