1000W Upgraded version of the mono amplifier board 1943 +5200 high-power rear amplifier board; 1. Board for mono rear amplifier board, need to dual-channel, buy 2 pieces. 2. Circuit design using A970/C2240 high voltage audio tube dual differential circuit and A1145/C2705 for voltage amplification. Push the use of medium power tube A1837/C4793, the output stage using A1943/C5200 high-power Toshiba tube. 3. Wide range of power supply, DC plus or minus 20V-90V can be, as long as enough power to easily reach 800W sound quality, driving force is extremely strong, to promote 15-inch speakers, no pressure! 4. Size: 200 * 75 * 45 L * W * H Weight: 440 grams 5. Power: undistorted power 800W, peak power: 1000W. Power supply: dual-voltage, DC positive and negative 20-90V (upgraded version has optimized circuitry and parts, can be directly on the high voltage, it is recommended to use 90V or less, do not challenge the voltage limit.) When ordering, please leave a message in the order, how much voltage you use, so that we can debug the most suitable effect for you. Independent speaker protection power supply 12V (AC, DC) input.