Summary: Type: subwoofer; Size: 30 cm (12 in.); The number of bands: 1; Power: 250 W (nominal); Sensitivity: 85 dB (W/m); Impedance: 4 Ohm; Housing: no; Recommended housing: closed box, vented; Number of speakers: 1; Dimensions: 300 mm; Cone material: polypropylene, covered with black zirconium; Mounting depth: 130 mm; The installation hole: 27 ...