SPEAKER

PURPOSE: To reduce the rise of temperature of a voice coil to obtain a speaker having a high resistance to input and less distortion by cutting inside and outside peripheral faces of a magnetic gap to provide air holes where the magnetic gap is partially expanded and forming an air path. CONSTITUTION: The outside peripheral face of a center pole 15 is partially cut to form a first air hole 29 between this outside peripheral face and the inside peripheral face of a voice coil bobbin 21. The inside peripheral face of an upper plate 18 is partially cut to form a second air hole 30 between this inside peripheral face and the outside peripheral face of the voice coil bobbin 21. When the speaker is operated, the air current passing the air hole 29 cools the inside peripheral face of the voice coil bobbin 21 and the center pole 15 adjacent to the voice coil bobbin 21. The air current passing the air hole 30 directly cools the outside peripheral face of a voice coil 20 and cools the upper plate 18, thus reducing the rise of temperature of the voice coil 20.