Summary: Type: subwoofer; Size: 25 cm (10 in.); The number of bands: 1; Power: 450 W (nominal), 900 watts (maximum); Frequency range: 23 - 300 Hz; Impedance: 4 Ohm; Built-in amplifier: no; Housing: yes; Enclosure type: closed box; Number of speakers: 1; Type of winding: double; ...