subwoofer speaker systerm OCW B701 10''/12'' Non-press Paper Cone4 ohm Impredance 250 /300 Watts RMS 500/600 Watts Max.Power 2.0'' Kapton Voice Coil 2x40/ 2x50Oz Ferrite magnet Mounting Dimensions: Depth:165/175mm Through Hole:245mm/285mm Diameter:280/324mm