Hertz Dieci DBX 30.3 High efficiency 12inch sub in a sturdy carpeted box, the DBX 30.3 enables great sub bass to be reproduced from modestly powered amplifiers. A budget system builders dream this feature filled box will keep the good times rolling! Technical Specification Speaker Size 300 (12) mm(in.) Power handling 1000 Watts peak 250 Watts continuous Impedance 4 Ohms Frequency response 28 - 300Hz Sensitivity 91dB/SPL Magnet size 115 x 50 x 25mm D x d x h 4.5 x 2 x 1in Total Driver Displacement 1,8 (109.8) cu (in) Voice Coil ∅ 38 (1.5) mm (in.) Magnet High density flux ferrite Cone Polypropylene with Mica injection Weight of one 8,4 (18.52) kg (lb.) *X-mech mm (in.) 16 (0.63) * X-mech: maximum mechanic excursion; indicates the maximum linear motion range of the speaker in both directions.