1. Use materials with guaranteed quality 2. Bridge single circuit 600W, double circuit 300Wand300W 3. Easy to use, temperature controlled or 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 or 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 RandLandto 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 x 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.