... .1 ch home theater 2.RMS:30W+10W*2 3.Speaker unit:4"+3"*2 4.Electroplating Knob 5.Support usb ... "/4Ω+3"/4Ω*2 IC: 3*2030 Total harmonic destortion: ≤13% S/N Raio: ≥70dB Frequancy response: subwoofer:35Hz-200Hz satellite ... : 648pcs/20GP,1576pcs/40HQ 2.1 Piano home theater system speaker ,With usb ,sd ,vfd display, fm , karaoke , mini remote function ...