The field of electro-acoustic electro-acoustic technology" core periodicals" in 2004tenth period published the company WU QI-JUN "no excitation magnetic moving-coil loudspeaker" papers, the papers from the unique angle of view, analyzes the speaker voice coil and magnetic circuit and the relationship between, put forward innovation" hysteresis sound " and the solutions. The patent technology has the potential to playback in the field to bring long-term and the profound influence, there are several foreign speaker factory is on the technology cooperation and transfer of substantive consultations.