The Marine 8 is a 2-way speaker with a 25mm (1'') tweeter and a 200mm (8'') polypropylene bass/midrange driver. It's IP66 certified for incredible durability, and even though it's the largest of the Marine speakers, it fits a compact 93mm (3.7'') depth with a 249mm (9.8'') cut-out diameter. The Marine 8 is designed to survive almost anything and the large 20cm bass/midrange driver ensures a powerful, heavy sound. Easy to install. A shallow installation depth of 93 mm means the Marine 8 fits almost anywhere.