Patent ID: 7130441
Filing Date: 2006-10-31
Classification: H04R

Abstract:
1. An acoustic signal output apparatus comprising: a speaker unit comprising: a compensation converter for converting an electrical signal into mechanical vibration, said compensation converter being fixed to a rear side of said main converter and having a second movable portion capable of moving along the predetermined axial line; a compensation mass body attached to said second movable portion, said compensation mass body for serving as a load of mechanical vibration of said compensation converter; a signal source for generating an output signal corresponding to an acoustic signal to be outputted; and a signal processing circuit for receiving the output signal of said signal source, at least one of amplifying and attenuating the output signal, and supplying said main converter and said compensation converter with the respective electrical signals such that the said first movable portion and said second movable portion move in opposite directions at the same time, wherein said compensation converter is smaller and lighter than said main converter.