A driver assembly, comprising: a housing structure; a magnet assembly within the housing structure and comprising: a permanent magnet; a plate structure underlying the permanent magnet; a voice coil circumscribing the permanent magnet and the plate structure; a yoke structure at least partially surrounding the permanent magnet, the plate structure, and the voice coil; and opposing spring structures coupled to the housing structure vertically offset at different vertical positions from one another and configured to impede horizontal movement of the permanent magnet, the plate structure, and the yoke structure while permitting vertical movement thereof; the driver assembly characterized by: a tubular structure provided within and vertically extending through aligned, centrally horizontally positioned apertures in the opposing spring structures and the magnet assembly and coupled to the opposing spring structures, wherein the tubular structure exhibits lateral projections at opposing vertical ends thereof, and the opposing spring structures are attached to the lateral projections. a housing structure; a magnet assembly within the housing structure and comprising: a permanent magnet; a plate structure underlying the permanent magnet; a voice coil circumscribing the permanent magnet and the plate structure; a yoke structure at least partially surrounding the permanent magnet, the plate structure, and the voice coil; and opposing spring structures coupled to the housing structure vertically offset at different vertical positions from one another and configured to impede horizontal movement of the permanent magnet, the plate structure, and the yoke structure while permitting vertical movement thereof; the driver assembly characterized by: a tubular structure provided within and vertically extending through aligned, centrally horizontally positioned apertures in the opposing spring structures and the magnet assembly and coupled to the opposing spring structures, wherein the tubular structure exhibits lateral projections at opposing vertical ends thereof, and the opposing spring structures are attached to the lateral projections. a permanent magnet; a plate structure underlying the permanent magnet; a voice coil circumscribing the permanent magnet and the plate structure; a yoke structure at least partially surrounding the permanent magnet, the plate structure, and the voice coil; and opposing spring structures coupled to the housing structure vertically offset at different vertical positions from one another and configured to impede horizontal movement of the permanent magnet, the plate structure, and the yoke structure while permitting vertical movement thereof; the driver assembly characterized by: a tubular structure provided within and vertically extending through aligned, centrally horizontally positioned apertures in the opposing spring structures and the magnet assembly and coupled to the opposing spring structures, wherein the tubular structure exhibits lateral projections at opposing vertical ends thereof, and the opposing spring structures are attached to the lateral projections. a tubular structure provided within and vertically extending through aligned, centrally horizontally positioned apertures in the opposing spring structures and the magnet assembly and coupled to the opposing spring structures, wherein the tubular structure exhibits lateral projections at opposing vertical ends thereof, and the opposing spring structures are attached to the lateral projections.