The anti-interference ability of the power amplifier depends on the connection line, and what power amplifier chip is used also has a great relationship. For example, the genuine TDA2030A can be anti-interference and will not be affected by mobile phone signals, and the domestic ordinary 2030 can be affected by mobile phone signals. The connection line inside the power amplifier can reduce the influence of mobile phone signals and various interference signals if the shielded line is used.