Patent ID: 9071897
Filing Date: 2015-06-30
Classification: H04R

Abstract:
1. A loudspeaker system having selectively a high frequency mode and a low frequency mode, wherein the high frequency mode is defined as being at a first predetermined range of frequencies above 200 Hz, and the low frequency mode is defined as being at a second predetermined range of frequencies below 200 Hz, the loudspeaker system comprising: a right main speaker; a right sub-speaker; a left main speaker; a left sub-speaker; a transformer comprising a first winding, a second winding, and a magnetic coupling effectively between the first winding and the second winding; a signal R applied to the right main speaker; a signal L applied to the left main speaker; a right differential signal comprising the signal R minus the signal L; a left differential signal comprising the signal L minus the signal R; the signal R applied to the right sub-speaker and conveyed by the first winding of the transformer when the loudspeaker system is in the low frequency mode; the signal L applied to the left sub-speaker and conveyed by the second winding of the transformer when the loudspeaker system is in the low frequency mode; the right differential signal applied to the right sub-speaker and transmitted by the magnetic coupling of the transformer when the loudspeaker system is in the high frequency mode; and the left differential signal applied to the left sub-speaker and transmitted by the magnetic coupling of the transformer when the loudspeaker system is in the high frequency mode.