Specifications:Model code : TRF T25-21RNominal diameter : 101MMOhmic resistance : 8 ohmPower watt MAX : 150 WPower watt RMS : 45 WSensitivity (1w/1m) : 109 dBFrequency range : 1200-18K HzVoice coil diameter : Φ25 mmMagnet dimension : Φ80*23 mmFs : 1200 HzRe (D.C.) : 5.8 ΩVoice coil wire : CCARVoice coil FORMER : HEXATECH ALUMINUM 1''Magnet : ferriteNet weight : 0.492 kgDimension : 10.1x6.7CM