Abstract: A speaker includes a case, a dome, a diaphragm, a first voice coil, a second voice coil, a first pole plate, a second pole plate, a first magnet, a second magnet and a yoke. The case is supported on the frame to form a receiving room therebetween. The yoke includes a bottom portion and a side portion perpendicularly extending upward from the center of the bottom portion. A first magnetic gap is formed between the inner wall of the side portion and the outer wall of the magnet for receiving the first voice coil, and a second magnetic gap is formed between the outer wall of the side portion and the inner wall of the second magnet for receiving the second voice coil.

Abstract: A diaphragm is disclosed. The diaphragm includes a dome part, an edge part connected to an outer peripheral part of the dome part. The dome part includes a main body defining a first surface and a second surface opposite to the first surface, a first dome part connected to the first surface, and a second dome part connected to the second surface.

Abstract: A diaphragm is disclosed. The diaphragm includes a dome part, an edge part connected to an outer peripheral part of the dome part. The dome part includes a main body defining a first surface and a second surface opposite to the first surface, a first dome part connected to the first surface, and a second dome part connected to the second surface.

Abstract: A speaker box includes a frame defining an upper side and a lower side opposite to the upper side, an electroacoustic transducer received in the frame and including a diaphragm with an edge thereof being fixed to the upper side of the frame, a case defining a plate facing the diaphragm and a sidewall extending upwardly from the plate and positioned on the upper side of the frame, a room formed between the diaphragm and the case, a hole defined at the side of the case for outputting the sound wave produced by the diaphragm. The plate defines a plurality of slots extending from the joint of the plate and the sidewall to towards the hole to connect to the hole, the slots being spaced each other and configured for leading the air of the room to get out through the hole.