The MF voice coil is of copper-coated aluminium ribbon, expensively edge-wound over a polyimide former to increase sensitivity by maximising the amount of copper in the magnet gap.

• 中频音圈为镀铜铝带，在其聚酰亚胺成形品上有昂贵的饰边，尽可能加大铜在磁隙中的量来增加灵敏度。