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Everything you love about Polk’s Dynamic Balance technology -that rich clean full range sound-is built into the marine tough yet ruggedly sophisticated DB+ series. And with its universal fit it can be installed in any vehicle Automobiles motorcycles boats ATVs-you name it. High Performance Factory Upgrade Upgrade from your OEM speaker system toward a bigger fuller high performance sound. The high grade materials used in our DB+ Series ensure you get an audio system that’s designed and engineered for clear full range sound that will last much longer than your factory setup. These speakers also feature non resonant materials so you get extremely clear highs mids and lows no matter what you’re listening to through our patented Dynamic Balance Db Technology. Universal Fit The new DB+ series has been updated so you can enjoy a simple drop in installation in any vehicle including cars boats ATV’s you name it. Its new shallow tweeter design ensures your factory speaker grille re installs with ease for a flush seamless look. This quick and easy experience also ensures a faster installation process so you can get back to what matters with our great sound always along for the ride. Marine Certified The DB+ Series is Ip65 rated so it’s dirt water resistant. It also has been tested for salt fog UV and humidity. A big part of that marine certification also means that each speaker has a non corrosive plastic grille a polypropylene UV tolerant cone waterproof inner and outer surrounds and stainless steel mounting hardware ensuring that it’s fully protected against the elements.