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3u 4*1200W Class H 4 Channel Stereo Sound System Professional Audio Amplifier. Wide Frequency Response: 20Hz-30KHz with +/-0.5dB accuracy for clear sound. Advanced Cooling System: 2 temperature controlled fans ensure stable operation. Comprehensive Protection: Protects against short circuit, overload, overheating, and DC. Professional Connectivity: Combo XLR inputs and Speakon outputs for reliable links. Low Distortion: Total harmonic distortion is minimal at rated power. High Signal to Noise Ratio: 110dB SNR ensures clean audio without background noise. CE RoHS Certified: Products meet international safety and environmental standards.