Features: The board is a single channel power amplifier board, which requires double channel The circuit design uses A970/C2240 high electricity sound pair tube double differential circuit and A1145/C2705 for electricity amplification to promote the use of power pair tube A1837/C4793, and the output stage uses A1943/C5200 power pair tube. Minus 20V-90V can be, as long as enough power is supplied to easily reach 200, the sound quality is good, the driving force is strong, and the 15-inch loudspeaker is pushed without pressure. Power supply: double electricity, minus 20-90V (the upgraded version has optimized the circuit and parts, but To directly apply high electricity, it is recommended to use below 90V, do not challenge the electricity limit. ) Real power: undistorted power 200W, power 300W. Specifications: Component:Plastic Size:Approx.120x60x45mm/4.72x2.36x1.77inch Package Includes: 1 Set Amplifier Board note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.