The Terra TrSUB-12 is a powerful, weather proof partial burial subwoofer that provides powerful, authoritative bass in the backyard, the garden or around the pool. Its water-tight rotationally molded Polyethylene enclosure is completely impervious to the elements and since it’s totally sealed there’s no concern about insects or small animals getting side and doing damage. The internal custom-built cast aluminum 12-inch woofer is a study in high performance, low distortion and all weather reliability. The TrSUB-12 is designed to be partially buried 2/3 of the way into the ground leaving its top exposed.