R.M.S.: woofer 　40w | satellite 　5w*4 | center 　5w Driver unit: woofer 5.25" | satellite 2*2.5" * 4 | center 2*2.5" | PMPO 　 　 Frequency response:　40Hz-18kHz Rated Impedance: 　4ohm Seperation :　 ＞50 db S/N :　>=70dB Input sensitivity: 500mv Yt-5004