Amazon.com has the Polk Audio DB651 6.5-Inch Coaxial Speakers (Pair, Silver) for $29.99 with Free Shipping.
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- 6.5-inch high-performance marine-certified coaxial speakers, perfect for boats of all types n
- 180 Watts power handling with 4-ohm impedance n
- 0.75-inch liquid-cooled silk-polymer composite dome tweeter n
- Polymer/Mica composite cone with butyl rubber surround for big sound and durability n
- Swivel-mount tweeter allows precise aiming of sound