HS-S803 Description Dimensions: W180*D318*H1070mm Frep.Response: 50Hz-20Khz Impedance: 4ohm Sensitivity: 89dB Signal Nosie Ratio: 86dB Rated Power: 30W-150W Net weight: 34kg/pair Features Elegant ,extremely attractive appearance. Craft is so fine that makes one won?t touch. Brand new digital doulbe Karaoke function Wooden structure, resonant vibration is avoided and in low noise. Powerful upgrade capability ,which gives you a chance to enjoy more perfecter music.