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Features:? Adopts two high quality TPA3116D2 digital amplifier chips.? Sound quality is very good, high efficiency and amplifying power.? 80W*2+100W? 2.1 channels(left/right channel and subwoofer channel), high efficiency and low-heat.? Powered by DC 12-24V, wide input voltage.? User can adjust the volume by themselves easily.? Applicable speaker impedance: 4-8 ohm.? Just connect the power supply and loudspeaker box, enjoy the pure digital music!? ? Notice: This amplifier board must be powered by DC power(DC12-24V), it`s better to use high-performance switch power. Don`t use transformer!? ? Specifications:? ?? Supply Voltage: DC 12-24V? Chip: TPA3116*2? Channel Type: 3 Channels(Left Channel, Right Channel, Subwoofer)? Output Power: 80W*2 + 100W Output Match: 4-8 ohm? Audio Output: Terminals? Frequency Response Range: 14-100KHz? SNR: 100dB? Switching Frequency: 1.2MHz? PCB Board Size: 100 * 70 * 30mm / 3.94 * 2.75 * 1.18in (L * W * H)? Weight: 113g / 3.98oz? Package Size: 13.5 * 11 * 5cm / 5.31 * 4.33 * 1.97in (L * W * H)? Package Weight: 178g / 6.3oz? ? Package included:? ? 1 x 2.1 Channel Audio Amplifier Board?