1. TDA2030: This chip is very classic and is widely used in home desktop or computer audio. Although there are many fakes on the market now, the real TDA2030 performs well in terms of sound quality. However, the sound quality of the LM1875 is generally considered better than that of the TDA2030 under the same circuit and components.

2. LM1875: This chip is deeply loved by people and is known for its unique musical flavor. The real LM1875 will make an obvious impact sound when it is turned on and off. This is a characteristic to identify authenticity. In addition, the back heat sink package shape is different from the TDA2030, which is generally slimmer and rounded at the end.

3. LM3886: This chip has large power and complete over-voltage, over-current and over-heat protection functions. It is especially suitable for use as a power amplifier or subwoofer amplifier circuit. It also has the function of automatically resisting current shock when switching on and off, allowing the speaker to work safely.

4. LM386: This chip is mainly used in children's electronic toys. It has a power of about 3W and is powered by a battery. Although the sound quality is relatively average, it is very suitable for toy applications.