Model:G4647 Spec:Inch 4x6 Technology Guide Line: Max. Input Power:120W Rated Input Power:25W Impedance:4Ω Frequency Response:65HZ-20KHZ Sensitivity:90dB /1w/1m Magnet:5.3 OZ Hight temperature Aluminum Voice Coil:0.75" Mylar cone Tweeter:　　1.5" Butyl rubber surround for smoother response Poly injection woofer cone with grid pattern surface Explain: Butyl rubber surround for smoother response Poly injection woofer cone with grid pattern surface