Patent ID: 9693132
Date: 2017-06-27
CPC Classifications: H04R

Claim:
1. A loudspeaker, including: a U-yoke holding a magnet, the U-yoke having a base with an upstanding side around the perimeter of the base; a frame having a ring around the U-yoke, the ring having a U-shaped cross-section with a base of the U forming an inner side of the ring and a top of each side of the U forming an outer side of the ring such that the U-shaped cross-section is orientated with the base of the U abutting the side of the U-yoke; a diaphragm connected to the frame by a resilient member around the diaphragm, the resilient member and the diaphragm being suspended from the frame; a first cavity defined by the diaphragm, resilient member, frame and U-yoke; a wall around the circumference of the frame, the wall sealing a top of the U-shaped cross-section of the ring forming a second cavity between the wall and the ring; a port in the frame between the first and second cavities, wherein