Structure of speaker use on ship

A speaker for use on a ship, the speaker having a base scat, a vibration shaft, a vibration board connected to the vibration shaft, a coil and a coil seat containing the coil, comprising:

• a coil housing enclosing an iron block therein, said coil housing being mounted between the base seat and the coil seat, said coil housing having a coil housing position and said coil seat having a coil seat position, wherein said coil housing position is fixed relative to said coil seat position, wherein a magnetic force is formed when a current is passed through the coil, the magnetic force being concentrated at the iron block which in turn attracts the vibration shaft to move, thereby driving the vibration board to produce vibration and resulting in production of sound;
• said coil scat including an upper surface, a lower surface, and a body portion positioned between said upper surface and said lower surface of said coil scat;
• said coil being wound around said body portion of said coil seat;
• said coil housing including a lower surface and a body portion, said body portion of said coil housing contacting said upper surface of said coil seat;
• and
• wherein said coil is totally enclosed by an enclosure formed from at least said body portion of said coil seat, said upper surface of said coil seat and said body portion of said coil housing.