GROUND ZERO GZUW 8SQ-D2. 20 cm / 8? Sound quality subwooferwith aluminum cast basket ans pressed paper cone. Scooped and pressed paper cone. Solid aluminum cast basket. 50 mm / 2? Coated paper dust cap. 200 – 400 Watts. 20 mm / 0.79? 181 mm / 7.13? 108 mm / 4.25? 4.8 L / 0.17 cu.