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4 Channel PA System Professional 2000W Power Amplifier Audio Amplifier. High Efficiency: Multi-loop control technology ensures efficiency exceeding 95%. Comprehensive Protection: Features under voltage, DC, overheat, temperature, and overload protection. Low Distortion: THD+N is less than 0.01% with S/N ratio of 112dB. Wide Voltage Range: Supports 90-260VAC power supply for global adaptability. Active PFC Technology: Uses active PFC and soft switching for stable performance in harsh environments. Versatile Application: Suitable for KTV, stadiums, conference halls, and professional sound systems. Customizable Options: Input sensitivity is optional with 41dB/38dB/35dB/32dB choices.