Patent ID: 8965009
Filing Date: 2015-02-24
Classification: H04R

Abstract:
1. A speaker used for a digital amplifier, comprising: a frame; a vibration unit disposed at the frame to generate an acoustic wave; an upper plate disposed under the frame; a lower plate disposed below the upper plate; a magnet disposed between the upper plate and the lower plate; a pillar disposed between the upper plate and the lower plate by passing through the magnet; a voice coil coupled to the vibration unit so as to make a piston movement by a magnetic field generated by an analog audio signal; and a low pass filter configured to convert a digital audio signal outputted from the digital amplifier to the analog audio signal, wherein the low pass filter comprises: an inductor wound on an outer circumferential surface of the pillar below the voice coil; and a capacitor mounted on a circuit board and electrically connected to the inductor.