Amazon.com: Polk Audio MM522 MM1 Series 5.25 Inch 300 Watt Max Full Range Coaxial Marine Boat ATV Car Audio Speakers with 1 Inch Tweeter, Black : Electronics
Polk Audio DB462 4" x 6" Coaxial Speaker Pair with Marine Certification
MM692 6" x 9" 3 Way Speakers | Car & Marine | Polk Audio™
Polk Audio db650 6-1/2" 2-way car speakers Certified for marine use at Crutchfield