Car Audio & Video. Rockville RBG18FA 18 3000 Watt Active Powered Vented Subwoofer With Folded Horn Design. Condition: BRAND NEW IN ORIGINAL PACKAGING. Ultra-efficient, Earthshaking Folded-Horn Powered Subwoofer. What the hell is a Folded-Horn Subwoofer anyway? Folded-Horn Reflex Technology Explained: Any “horn” shape, which gradually expands from a small inlet to a large opening, will […]... Read More