Patent ID: 8385580

Claim:
An acoustic transducer comprising: a magnetized permanent magnet subassembly supported by a third non ferrous frame structure; a ferromagnetic cylinder seated within and affixed to a second non ferrous frame structure, the second non ferrous frame structure being configured for heat dissipation such that the ferromagnetic cylinder and the second non ferrous frame structure are in a thermally conducting heat dissipation relationship, the second non ferrous frame structure being bolted to the third non ferrous frame structure to provide an annular gap between the ferromagnetic cylinder and the magnetized permanent magnet subassembly, said third non ferrous frame structure including a self alignment feature for aligning and stabilizing the magnetized permanent magnet subassembly relative to the third non ferrous frame structure; a voice coil cylinder carrying at least one two conductive winding windings, a first of said at least two conductive windings being spaced from a first end of said voice coil cylinder, and a second of said at least two conductive windings being spaced from a second end of the voice coil cylinder, the voice coil cylinder supported within the annular gap by an inner a first suspension member attached to one of said opposite ends which is associated with also attached to the third non ferrous frame structure and an outer a second suspension member attached to the other of said opposite ends which is also attached to a non ferrous frame structure other than the third non ferrous frame structure so that said voice coil cylinder encases all permanent magnetic material of the acoustic transducer; and a mechanically supported sound producing cone connected to the voice coil cylinder.