Feature: 1. The use of high-quality materials is guaranteed 2. Bridge single-channel 600W, dual-channel 300W+300W 3. Easy to use, temperature control/manual control fan 4. Use oxygen-free copper wire to improve sound quality; The magnetic shielding mechanism has strong resistance 5. With front stage amplification, 26-36dB adjustable Product parameters: Product name: 300W dual channel /600W mono power amplifier board Power amplifier chip: TPA3255 Power supply: working voltage range DC18-50V, It is recommended to use a DC 36-48V power supply and a current of more than 10A. The higher the voltage, the greater the output power. Maximum power: In BTL mode, 2x300W@50V 4Ω, 160Wx2@50V 8Ω; In PBTL mode, 600W@50V 2Ω, 300W@50V 4Ω, 160W@50V 8Ω Recommend speaker: BTL dual channel output, 3-8 ohm, 50-300W; PBTL mono mode , 2-8 ohms, 100-600W Heat dissipation mode: temperature control automatic air cooling, or manual selection of fan rotation. Gain selection: Potentiometer 10-speed adjustment, 26dB-36dB Protection mechanism: input undervoltage, overheat, overcurrent, short circuit protection. No input anti-reverse protection, positive and negative terminals can not be reversed! Material: plastic colour: black Package Contents: 2 x Digital 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.