A driver unit with extended power, response, and reliability performance is described, with improvements resulting from new materials and techniques. The flexure of a new industrial material, polyimide, provides higher fatigue strength at high diaphragm displacement and high moving coil temperature. Aluminum ribbon anodized for insulation reduces the overall weight of the moving system. The method of coil termination and takeoff lead design allows higher power and reliability. Heat treatment of the aluminum diaphragm increases its fatigue strength.
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