Patent ID: 6522757
Filing Date: 2003-02-18
Classification: H04R

Abstract:
A bass intensifying device for a speaker system, in which a passive radiator constructed by a speaker unit having a magnetic circuit and a voice coil is disposed at a location where it receives a sound pressure from a main speaker unit driven by an amplifier, and a motion feed-back circuit independently of a drive circuit of the main speaker unit is connected to the passive radiator, the main speaker unit and the passive radiator are installed in an enclosure and a corn of the passive radiator has access to outside of the enclosure, whereina vibration of a diaphragm of the passive radiator caused by a sound pressure from the main speaker unit makes the voice coil vibrate to generate an audio signal therein, the audio signal is amplified in the motion feed-back circuit, and the amplified signal is applied to the voice coil, thereby the passive radiator generates a sound outside of the enclosure under a control of the motion feed-back circuit.