The Marine 6 is a 2-way speaker with a 25mm (1'') tweeter and a 150mm (6'') polypropylene bass/midrange driver. It has an IP66 rating for incredible durability and is the most compact of the Marine speakers, fitting 88mm (3.5'') deep with a 200mm (7.8'') cut diameter. Against the evidence. Whether wet or sprayed with seawater, the Marine 6 is designed to give you great sound. Built to sound powerful. With a stainless steel chassis and grille and polypropylene drivers, the Marine 6 sounds great even in a storm.