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WEATHERPROOF - The MRWT40 is equipped with modern weatherproofing methods for defense against weather conditions. CONE - Constructed from polyurethane, the MRWT40 4-inch marine waketower speakers provide a tough and long-lasting material that can deliver excellent sound with the benefit of enduring performance. VOICE COIL - The voice coils can resist high temperatures while preserving their strength and fatigue characteristics. This provides the speakers the benefit of extended play times with reduced weight. SURROUND - Rubber has the capacity to withstand significant stress without showing any damage. It supports the entire speaker structure by tolerating continuous strain where it is most required, without the deterioration. SPECS - Impedance: 4 Ohms, frequency: 130 Hz to 20 kHz, dimensions: 7.1 x 5.4 x 7.1, Weight: 5.9 lbs