Summary: Type: subwoofer; Size: 30 cm (12 in.); The number of bands: 1; Sensitivity: 91 dB (2.83 V/m); Frequency range: 25 - 1000 Hz; Impedance: 4 Ohm; Housing: no; Recommended housing: closed box, vented; Number of speakers: 1; Dimensions: 300 mm; Cone material: pressed pulp with the addition of cotton fiber with damping and moisture-proof impre ...