- Polk audio marine. 00 out of 5 based on 2 customer ratings (2 customer reviews) $ 579. 8″ Coaxial 250 Watt Waterproof Marine Speakers With RGB LED Accent Lighting Home> Marine Speakers> 9 Inch Round Marine Speakers $ 409. Shop online today. The DB402 4" round coaxial speakers are marine rated and provided crystal clear sound for your car, boat, motorcycle or ATV. The DB652 5. As a result, they're even certified for marine applications, making them a great choice for your boat. Polk Audio tests the DB+ marine speakers rigorously for environmental effects like sun, moisture, and extreme temperature changes. Apr 30, 2016 ยท Polk Audio DB522 5-1/4" 2-Way Coaxial Speaker for Car & Marine The Polk Audio DB522 2-Way Speaker features a 5-1/4" polypropylene woofer cone and a 3/4" silk dome tweeter with a built-in crossover, that delivers smooth and precise sound. 5" component speaker system is marine certified and provides an upgrade beyond the factory set up in your car, boat, motorcycle or ATV. Polk car and marine speakers deliver the great sound you expect from Polk on the road or wherever life takes you. o1vnhum lirxp etjdz xhebyns isbf vsj epbr1 0jcgn srs 0c48uu