MODEL:TRF VL SW62 D2 SIZE: 6inch CONE:competition grade paper SURROUND MATERIAL:foam VOICE COIL:2 inch RMS POWER:250 WATT SENSITIVITY:85.3db MAX WATT:500wmaxx RESORANCE FREQUENCY(fo):46.6Hz MECHANICAL Q FACTOR(Qms):2.51 ELECTRICAL Q FACTOR(Qes):0.6 TOTAL Q FACTOR(Qts):0.45 X MAX:9 mm FORCE FACTOR:12.1 N/A MAGNET WEIGHT:40 oz 1=Outer Dimension:166mm 2=Mounting Depth:87mm 3=Magnet Dimension:120mm 4=Mounting Hole Dimension:145mm