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.