Patent ID: 7225895

Claim:
A loudspeaker comprising: a frame having an interior bottom surface with a side portion extending upward from, and surrounding, said interior bottom surface, said side portion terminating in an exterior edge of a uniform first height above said interior bottom surface with said exterior edge defining an opening into the frame having a first predetermined size and shape; a cone having an outer edge and an inner edge, and a top surface and a bottom surface with said outer edge being substantially the same shape as, and a second size that is smaller than said first size defined by the exterior edge of the frame, with said inner edge defined by a centrally located circular hole of a first diameter through the cones, said first diameter having a third size that is smaller than said second size; a first flexible suspension connected between the exterior edge of the frame and the outer edge of the cone; an audio motor including a magnet assembly, having an air gap mounted to the bottom surface of the frame and a thin walled bobbin having an outer surface of a second diameter with a first end with a voice coil wound thereon and located in said air gap, and a second end with the inner edge of said cone attached to an outer surface of the bobbin at or near said second end, said first diameter and said second diameter being substantially equal one to the other; and a stiff flat diaphragm having an outer edge, a top surface and a bottom surface; said stiff flat diaphragm having a third size that is substantially the same or smaller than said second size and is substantially the same shape as said opening defined by the exterior edge of the frame; the outer edge of the diaphragm connected to the top surface of the cone at or near said outer edge of said cone; and the bottom surface of said stiff flat diaphragm having a perpendicular connection to said second end of the bobbin; wherein said top surface of said cone, a portion of said bottom surface of said stiff flat diaphragm and said perpendicular connection define an enclosed triangular area that encircles a center portion of said loudspeaker.