Model: TPA3255 2.0 channel active speaker amplifier board Output channel: 2.0 channel Amplifier chip: TPA3255x1 Input port: RCA, XLR Frequency response range: 20-20KHz<br><br>Working voltage: DC24V-48V Output power: 300W+300W/4 ohms Total harmonic distortion: 0.06% Signal-to-noise ratio: 108dB Protection mechanism: overheat protection, overcurrent protection, power-on delay protection Instructions 1. The output of the amplifier board can only be connected to passive speakers, not active speakers and constant voltage speakers. 2. The amplifier uses DC24V-48V power supply. The higher the voltage, the greater the power, but it cannot exceed 48V, otherwise the amplifier will burn out. The power plug is 5.5x2.5, positive inside and negative outside. Color: black Material: aluminum alloy<br><br>Package Contents: 1 x TPA3255 digital amplifier board<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.