MODEL:TRF VL SW102 D2 SIZE: 10inch CONE:competition grade paper SURROUND MATERIAL:foam VOICE COIL:2 inch RMS POWER:250 WATT SENSITIVITY:88db MAX WATT:500wmaxx RESORANCE FREQUENCY(fo):35.2Hz MECHANICAL Q FACTOR(Qms):2.91 ELECTRICAL Q FACTOR(Qes):0.6 TOTAL Q FACTOR(Qts):0.5 X MAX:9 mm FORCE FACTOR:12.1 N/A MAGNET WEIGHT:40 oz 1=Outer Dimension:260mm 2=Mounting Depth:125mm 3=Magnet Dimension:140mm 4=Mounting Hole Dimension:238mm