Patent ID: 9271071
Filing Date: 2016-02-23
CPC Classification: H04R

Claim Text:
1. A magnetic assembly for a loudspeaker comprising: a magnet for producing a magnetic field; a top plate provided adjacent a top surface of the magnet; a rear plate provided adjacent a rear surface of the magnet; a pole piece positioned adjacent the top plate and the rear plate, the pole piece having a through bore defining an inside surface of the pole piece, the inside surface of the pole piece facing the through bore; a first projection that projects into the through bore from said inside surface of the pole piece; a second projection that projects into the through bore of the pole piece from a surface of the rear plate; wherein the pole piece and the top plate are positioned adjacent each other to define a first air gap for a first voice coil; wherein the first projection and the second projection are arranged adjacent each other to define a second air gap within said through bore for a second voice coil.