Rockustics ONESUB-S SubwooferRockustics Outdoor OneSub Subwoofer in Sandstone The Rockustics OneSub and DubSub subwoofers are built with a durable, rock enclosure designed to withstand rain, frost, snow, and ice. The OneSub is a stand alone, passive sub that requires a sub amplifier with an active crossover while the DubSub functions as a Sub Sat system. Simply wire two additional, full range speakers to the DubSub and create a three speaker sub sat system that can then be