伴随着科学技术的迅速发展，人们生活水平的不断提高，对音频功率放大器的要求越来越高。音频是多媒体中的一种重要媒体。人能够听见的音频信号的频率范围大约是 60Hz-20kHz 其中语音大约分布在300Hz-4kHz之内，-With the rapid development of science and technology, improve people' s living standard, the audio power amplifiers have become increasingly demanding. Multimedia audio is an important media. One can hear the audio signal frequency range is about one voice about 60Hz-20kHz in 300Hz-4kHz distribution within