Summary: Diameter: 7.7 Inch; Sensitivity: 90.5 dB; Impedance: 4 Ohm; Frequency Response: 45-25000 Hz; Peak Power Handling (Watts): 225 Watts; Color: Gunmetal; RMS Power Handling: 70 Watts; Marine Tested: JL Audio's marine speakers are tested in ultraviolet chambers to simulate years of sun exposure, and salt fog chambers to simulate years of exposure to salt-water environments.; Woofers: The woofer cones are injection-molded, mica-filled polypropylene with UV inhibitors, synthetic rubber surrounds, and marine-grade synthetic fiber spiders.; DMA (Dynamic Motor Analysis): DMA is JL Audio's proprietary method of improving dynamic motor behavior. The DMA-optimized long-excursion design enhance ...