250W power board test condition input 12V, transmission positive and negative 12V-24V voltage adjustable (please specify the required input and output voltage when the customer purchases). ±12V output no-load is about ±13.5V, ±15V output is about 16.5V, and it will be reduced after loading. Generally, the power amplifier circuit has a certain voltage adaptation range. If it is installed in the car, the actual working voltage of the car is about 13.5V. The output will be higher.