Sony XS-MP1611 6-1/2" Dual Cone Speakers stand up to the sun, saltwater, and spray, all while sounding nothing short of amazing. Water-resistant, UV-coated front or rear mounting XS-MP1611 speakers make for an ultra-durable addition to any watercraft. Ferrite magnets and polypropylene cones in the Sony XS-MP1611 speakers work together to deliver up to 140 watts of pure power that makes rocking the boat a blast. Frequency response: 45 - 20,000 Hz. Impedance: 4 ohms. Overall: 6-7/8" dia. Depth: 2-1/8". Cutout: 5" dia.