ASA Electronics MS5006WR Speaker 30 Watts Max Power Handling, Sensitivity 86dB Frequency Response 79Hz-20kHz, Nominal Impedance 4 Ohms 1-1/2" Mounting Depth, 4-3/8" Mounting Hole Diameter ASTM B117 Salt Spray Exposure Standard Compliant ASTM D4329 UV Exposure Standard Compliant