Summary: Type: subwoofer; Size: 30 cm (12 in.); The number of bands: 1; Power: 400 W (nominal), 600 watts (maximum); Impedance: 4 Ohm; Built-in amplifier: no; Housing: yes; Enclosure type: vented; Number of speakers: 1; Dimensions: 300 mm; Type of winding: double; ...