Summary: Type: subwoofer; Size: 20 cm (8 inches.); The number of bands: 1; Power: 400 watts (nominal), 800 watts (maximum); Sensitivity: 84 dB (W/m); Impedance: 1 Ohm; Case: no; Featured case: closed box, vented; The number of speakers: 1; Dimensions: 200 mm; Mounting depth: 67 mm; The installation hole: 177 mm; Type winding: double; ...