Polk Audio DB402 User Guide 2 - Page 2
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IP56 rating (water- and dirt-resistant) Waterproof inner and outer surrounds keep the elements out UV tolerant cones Tested for salt-fog, UV and humidity 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 Plus series. And with its universal fit, it can be installed in any vehicle: automobiles, motorcycles, boats, ATVs-you name it. Features High Performance Upgrade Upgrade from your OEM speaker system toward a bigger, fuller, high-performance sound. Marine Certified Built to last for cars, boats and ATVs with an IP56 rating and tested for Salt-fog, UV & Humidity. Universal Fit Simple drop in installation for any vehicle including cars, boats, ATV's -- you name it. Zero Tweeter Protrusion A shallow tweeter design to ensure your factory speaker grille re-installs with ease for a flush, seamless look. Dynamic Balance Technology Patented process that guides material selection through rigorous testing that identifies and cancels out unwanted resonant frequencies.