Power supply board test conditions input DC 12V, ± 15V version of the output, no load, no load about plus or minus 15-16V, ± 18V version of the output, no load, no load, no load, about plus or minus 18-19V, ± 24V version of the output, no load, no load, about plus or minus 24-25V, ± 35V version of the output, no load, no load, about plus or minus 35-36V, with a load will be lowered a little bit after the power amplifier circuits have certain The amplifier circuit has a certain voltage adaptation range of a few volts high and low does not matter, if installed in the car, the car's actual operating voltage of about 13.5V, the output voltage and power will be higher.