Summary: Type: subwoofer; Size: 20 cm (8 inches.); The number of bands: 1; Power: 200 watts (nominal), 400 watts (maximum); Sensitivity: 85 dB (W/m); The frequency range: 30 - 500 Hz; Impedance: 4 Ohm; Case: no; Featured case: closed box, vented; The number of speakers: 1; Dimensions: 200 mm; Mounting depth: 98 mm; The installation hole: 177 mm ...