Polk Audio db521

Power range: 4-45 watts RMS (135 watts peak power) Frequency response: 60-22,000 Hz Sensitivity: 93 dB Dynamic Balance Polymer/Mica Composite Mineral Filled Cone is stiff yet lightweight for big sound, little distortion. Marine Certified Polk db Series speakers are built tough to withstand the toughest environments so they are perfect for use in boats of all types. That's why Correct Craft offers Polk Audio speakers in their award-winning Nautiques ski and wakeboarding boats. 19mm Liquid-Cooled Silk/Polymer composite Dome Tweeter with Neodymium magnet for clear, detailed highs. Low-mass 2-Layer 25mm Kapton Voice Coil former is lightweight for high sound output. Kaptons high melting temperature (725F/400C!) ensures high power handling and kick-butt reliability. Muscular ABS Grilles, computer optimized and based on exclusive MOMO designs. Durable Butyl Rubber Surround wont fall apart under the stress of extreme temperatures, sunlight or time, for years of the great Polk sound. Pole Plate Heat Sink promotes better heat dissipation for superior power handling and reliability. Flat Spider for faster, longer excursion linear motion. Flexible Woven Leads sewn directly into Spider for greater reliability. Rock solid, acoustically inert Stamped Steel Basket finished in rustproof Gun Metal Gray. Stainless steel mounting hardware. One year parts & labor  more