Boss Audio 6.5 Dual Cone Marine Coaxial Speakers MR6W 6.5 Dual Cone Marine Coaxial Speaker Pair - 180W - White. Boss Audios 6.5 Dual Cone 180-watt Marine Coaxial Speaker. Features Speaker Type Coaxial Configuration Dual Cone Woofer Size 6.5 Color White Supplied Grill Yes Mounting Depth 2.1875 Mounting Diameter 6.75 Standard Warranty 1 Year Specifications Peak Power Handling 180 Watts System Impedance 4 System Sensitivity 1W1m 89 dB System Frequency Response 80 Hz to 20 kHz, - 1 dB Specifications