Feature: 1. SPECIFICATIONS: Digital power amplifier board features bridge type single circuit 600W, dual circuit 300W and 300W, with front end amplification, adjustable from 26 to 36dB. 2. EASY TO USE: Temperature control, manual control of the fan, the power amplifier module has a fast heat dissipation. And operates with a long service life. 3. EXCELLENT PERFORMANCE: Adopting oxygen free copper wire to improve sound quality; The magnetic shielding mechanism has extremely strong anti electromagnetic interference EMI performance. 4. PROTECTION MECHANISM: Built in input undervoltage, overheating, overcurrent, and short circuit protection, this power amplifier ensuring long term safe and stable operation. 5. BRIDGING METHOD: Turn off the power supply first, turn the No.1 dial switch to the ON position, and output the R and L and parallel short circuit output, while R L parallel short circuit output. Specification: Item Type: Digital Power Amplifier Board Mode: ZK 3002 Material: PCB Power Amplifier Chip: TPA3255 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 selected fan for continuous operation. Gain Selection: Potentiometer 10 speed adjustment, 26dB to 36dB Bridging Method: Turn off the power supply first, turn the No.1 dial switch to the ON position, and output the R and L and parallel short circuit output, while R L parallel short circuit output. Maximum Power: In BTL mode, 2 x 300W at 50V 4 Ω, 160W at 50V 8 Ω In PBTL mode, 600W at 50V 2 Ω, 300W at 50V 4 Ω, 160W at 50V 8 Ω Protection Mechanism: Input undervoltage, overheating, overcurrent, short circuit protection. No input anti reverse protection, positive and negative poles cannot be reversed . Package List: 1 x Digital Power Amplifier Board