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ePathChina Power Amplifier Audio Karaoke Home Theater Amplifier 2 Channel Class D Amplifier USB/SD AUX InputAudio Sensitivity: 025mv-50mv Impedance: 4 - 16O Signal To Noise Ratio: 85dB Out Power: 2 x 20W Number of channels: 2 Frequency Range (Hz): 875MHz - 1080MHz Frequency Response: 20Hz - 20KHz Material Type: Aluminum Alloy Product Weight: 200 g ..