The Polk Audio DB651 features 6-3/4 inch adaptor rings and 180 Watts power handling with 4-ohm impedance. 6.5-inch high-performance marine-certified coaxial speakers, perfect for boats of all types 180 Watts power handling with 4-ohm impedance 0.75-inch liquid-cooled silk-polymer composite dome tweeter Polymer/Mica composite cone with butyl rubber surround for big sound and durability Swivel-mount
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