Product Name : JW1286008 Product Description : Professional Audio Speaker ; Usage For Woofer Price of product ( USD price or FOB price) : 1USD---98USD Product origin : 1USD---98USD Key Specifications : Guangzhou P.R China Special Features : frame diameter : Diameter 315mm (12 in) Nominal impedance : 8 VOICE COIL DC resistance : 5.4 Nominal power handling : 350W Continuous power handling : 550W Sensitivity (SPL1W/1m) : 94.8+/-2 dB Frequency range : F0~3 kHz Voice coil diameter : 86mm (3 in) Winding Material : Copper Diaphragm Material : Paper Magnet Material : Ferrite Minimum Order Size and Packgaing details : Fms: 54.2Hz nref : 2.14% Res : 83.6 bl : 21.2N/A Re : 5.4 spl : 95.3dB Qms : 12.34 vas : 44.0L Qse : 0.32 RP : 136.0 Qts : 0.31 LP : 44.9mH Rms : 2.1kg/s cp : 240.4 F Cms : 0.11mm/N le : 1.04mH mms : 77.3gr sd : 530.9c?