Rock the boat with these Dual 6.5" Coaxial Marine Speakers (Pair). Each speaker combines a 6.5" polypropylene woofer with a 19 mm tweeter for a frequency response of 65 Hz - 20 kHz to accurately reproduce sound. The UV-impregnated speaker grilles are heat resistant, and a waterproof design helps them stand up to stormy weather. Dual 6.5" Coaxial Marine Speakers (Pair) - Mrne Electrncs And Radios at Academy Sports