Please ask the speaker of a CHN 4558C op-amp chip, the amplifier chip is two YD2030 and two TDA2030A upgrade polishing change op-amp can be used which

4558 op-amp parameters are exactly the same as the LM358, for audio amplifier sound quality is very general. Suggest you use LM4562, its operating voltage range is wide, high precision.

LM4562 is a high-fidelity dual operational amplifier introduced by National Semiconductor in recent years, its distortion is ultra-small, only 0.00003% of the total harmonic distortion and noise (THD + N), in other words, the distortion of this operational amplifier is almost negligible.

The LM4562 chip features extremely low distortion, low noise, high slew rate, a wide operating voltage range, and high output current for unprecedented performance. Because of these advantages, this operational amplifier is suitable for professional-grade and high-end audio systems, such as audio/video system receivers, preamplifiers, audio decoders and hi-fi amplifiers, as well as various medical imaging systems and industrial equipment.

The LM4562 chipset is uniquely designed with a high-speed 6MHz unity-gain bandwidth operational amplifier and a proprietary stereo audio driver amplifier. In standard operation, the op amp has an input noise density as low as 2.7nV/√Hz, a midrange noise corner of 60Hz, and an output current of 26mA to drive a 600Ω load. The LM4562 features a slew rate of 20V/μs and a gain bandwidth of 55MHz.

The LM4562 chipset can be configured to operate in either ±2.5V or ±2.5Mbps, with a maximum of 1.5Gbps. The LM4562 is capable of stable operation over a supply voltage range of ±2.5V to ±17V, with a maximum output current of 45mA. When operated over this supply voltage range, the chip's input circuitry achieves a ****-mode rejection ratio (CMRR) and power supply rejection ratio (PSRR) of more than 108dB, while the input bias current is as low as 10μA (typical).

YD2030 is a domestically produced amplifier IC with exactly the same parameters as TDA2030. The sound quality is average. Interested you can switch to TDA2040, LM1875 to try, the effect is good.