Product Description: This amplifier board from a mature and stable circuit, dual differential input and increased signal processing at the input, drive stage with a pair of imported transistors 1930 5171 plus 5200 1943 for composite drive, and then 22 transistors for the power stage output, the maximum power output can reach 1000w +1000w, power is very strong, the low frequency is very strong, rich in detail. Recommended the use of AC dual 35-70V toroidal transformer (400w or more), and then add rectifier power supply board after use, the protection circuit requires a separate power supply (AC 12-18v, must use independent windings, can not be shared with other), 400w transformer is just a reference, in fact, can reach high power output transformer also need to be larger. Parameters: Output power: 1000W + 1000W 4ohms , 600W + 600W 8ohms Frequency response: 20HZ-20KHZ Harmonic distortion: 0.01% Magnification: 25 times Supply voltage: main voltage DC double 50-100V, to have to add their own separate power rectification board Protection circuit AC single 12-18V (to independent power supply, can not share) Material: PC+metal colour: blue Package Contents: 1 x Power 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.