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Rated Impedance: 4Ω±0.5ΩOutput Power: 2W*2(1KHZ,THD10%)Supply Voltage: 5V(4——9V and PC USB)Circuit Current: ≤500mAFrequency Response:(180HZ——20KHZ),Degree of Dissociation : ≥45dBSupply Voltage Rejection: ≥48dB