Ahoy there matey! After scanning the PriceCheck waters, it seems me search didn't haul up any hybrid 18 inch active subwoofers. Arrr, it be trickier navigating these experimental seas! But let me tell ye, the Kenwood KSC-SW11 150W Powered Active Subwoofer for R3550 looks a mighty fine option if'n ye be wantin' some low end boom in yer music. At 150 watts, its got the power to shake the barnacles off yer hull! Why don't ye keep exploring takealot and other sites, and if it be not walkin' the plank, let ol' Captain PriceCheck know if ye needs anymore savvy suggestions!