1. Use high-quality materials with guaranteed quality 2. Bridge single circuit 600W, double circuit 300W+300W 3. Easy to use, temperature controlled/manual control fan 4. Use oxygen free copper wire to improve sound quality; The magnetic shielding mechanism has strong anti electromagnetic interference performance 5. With front-end amplification, 26-36dB adjustable Product name:300W dual channel/600W mono pure rear stage power amplifier board Power amplifier chip:for-original TPA3255 Product model:-3002 Adapted power supply:Working voltage range 18-50VDC, limit 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 BTL dual channel mode; 2-8 ohms, 100-600W in PBTL mono mode Heat dissipation method:temperature controlled automatic air cooling, or manually selecting the fan to keep running. Gain selection:Potentiometer 10 gear adjustment, 26dB-36dB Bridging method:First cut off the power, turn the No.1 dial switch to the ON position, and short connect the output end R+L+to parallel output, while short connect the R-L to parallel output. Maximum power: In BTL mode, 2x300W@50V 4 ohm, 160W@50V 8 ohm; In PBTL mode, 600W@50V 2 ohm, 300W@50V 4 ohm, 160W@50V 8 ohm Protection mechanism:Input undervoltage, overheating, overcurrent, short circuit protection. No input anti reverse protection, positive and negative poles cannot be reversed! Colour:Black Material:ABS Package Contents: 1 * Speaker 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.