Boss MR10 2-Way Marine Box Speaker POWER HANDLING, PEAK 100W MAGNET STRUCTURE, 30 Oz; IMPEDANCE 4 or 8 OHM; FREQUENCY RESPONSE, 100HZ-20KHZ SPL 1 WATT/1 METER, 91dB; CONE MATERIAL, POLY VOICE COIL, 1-Inch ALUMINUM; TWEETER 1-Inch MYLAR DOME; GRILLES, METAL FERRO FLUID ENHANCED