DYNAMIC LOUDSPEAKER AND ITS AUDIO AMPLIFIER CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide a dynamic loudspeaker whose frequency characteristic can be adjusted in response to its peripheral structure and mount structure or the like. SOLUTION: A voice coil 2 fitted to a base end of a cone type diaphragm 1 enclosed by a frame 9 is driven in a magnetic field generated by a magnet 4 in response to an audio signal. A sub voice coil 10 is fitted to an outer circumference at a tip of the diaphragm 1 and a magnet 12 is provided at the frame 9 to provide a magnetic field to the sub voice coil 10. This sub voice coil is driven by an audio signal corresponding to the audio signal supplied to the voice coil 2.