Name: 300W dual channel/600W mono pure rear stage amplifier board Amplifier chip: TPA3255 Adapted power supply: The working voltage range is 18-50VDC, with a limit of 53V. It is recommended to use a DC power supply with a voltage of 36-48V and a current of 10A or more. The higher the voltage, the greater the output power. Adapted speaker: 3-8 ohms, 50-300W in dual channel mode; 2-8 ohms, 100-600W in PBTL mono mode Heat dissipation : Temperature controlled automatic air cooling, or manually selecting the fan to keep running. Gain selection: Potentiometer 10 gear adjustment,26dB-36dB Bridging : Turn off the power first, turn the No.1 dial switch to the ON position, and the output end R+ L+ is short circuited in parallel for output, while R - L - is short circuited in parallel for output. Maximum power: In mode,2*300W@50V 4,160W@50V 8 In PBTL mode,600W@50V 2,300W@50V 4,160W@50V 8 Protection mechanism: Input under voltage, overheating, over current, short circuit protection. No input anti reverse protection, positive and negative poles cannot be reversed! Colour:black Material:plastic Size:about 125x65x38mm Package Contents: 1 x 300W dual channel/600W mono pure rear stage amplifier board 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.