Garmin Fusion Signature Series 3i Marine Subwoofer Marine Electronic Accessory - Bring the thunder. The Signature Series 3i subwoofers deliver the drama with the premium low frequencies to enhance your listening experience. Crystal-clear premium sound quality is suited for the marine environment. Water-resistant connectors provide simplified installation and superior protection. The rigorously tested marinized design has an IP65 rating. Available in classic 10in design as well as 10in and 12in sports style design. CRGBW LED lights set the scene on your boat. Built to last season after season, the Signature Series 3i subwoofers include a supported 3-year warranty.