Summary: Diameter: 8 Inch; Sensitivity: 92 dB; Impedance: 4 Ohm; Frequency Response: 20-24000 Hz; Peak Power Handling (Watts): 180 Watts; Color: Black; RMS Power Handling: 90 Watts; Marine Grade Protection / IPX Rating: LIFE SHIELD protected for water and dust. UV protected against sun fade.; Tweeters: 1 inch pure Titanium dome tweeter for very smooth musical response, high output with minimal required amplifier power.; Cone Material: 8 inch water resistant composite polypropylene cone with temperature stable Butyl rubber surround mounted on a lightweight composite frame.; Surround / Cone Coupling: Natural Butyl Rubber Surround remains musical in all weather. Does not stiffen in cold.; Voice Coil / ...