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Ke Audio HiFi Professional Amplifier De4 Two Channels Class Ab. Pure Copper Transformer: Enhanced power delivery with minimized resistance, reduced heat, and high stability. Superior Sound Quality: Employs ON gold-bonded transistors for efficient current amplification and clarity. Customizable Sound Effects: Allows users to tailor sound effects to specific speaker characteristics. Digital-Analog Protection: Features a proprietary integrated system for stable and reliable operation. Professional Grade Design: Class AB two-channel amplifier suitable for Hi-Fi, AV, and KTV systems.