This problem involves many factors, such as sound sensitivity, impedance and so on. Generally speaking, however, a certain current signal needs to be input to make the 1W 8Ou paper cone speaker sound normally. The specific current depends on the output power and output impedance of the sound source, as well as the amplification factor and output impedance of the power amplifier circuit. Generally speaking, the output impedance of the power amplifier circuit should match the impedance of the horn to obtain the maximum power output, and at the same time, care should be taken not to overload the horn. The common audio input current signal range is 10- 100 mA, and the actual value needs to be calculated according to the specific situation.