It has a vented back for better coil cooling, better frequency response, and lower distortion. It also features a shorting ring design. The included aluminum housing can be used for flush mounting, or you can remove the BT30 from the housing for installation in those tight factory locations.
Incorporates water resistant features enabling it to be used in applications where moderate exposure to moisture will not result in damage to the product. Marine Grade products are not waterproof, and submersion or excessive moisture exposure may result in product failure. DD Audio Marine Grade products are not certified for saltwater environments.