Polk DB652 Ultramarine Dynamic Balance Coaxial Speakers, 6.5" - Pair Dynamic Balance technology delivers signature quality sound Marine certified (IP55); Polypropylene and UV tolerant cone with waterproof surrounds 92 dB sensitivity (1 watt @ 1 meter); 40 Hz to 22kHz frequency response 100W Continuous power handling; 300W Peak power handling Includes removable sport grilles