There is noise in the speaker of the electric piano.

Electric pianos with high-power speakers will have a slight current sound, including Roland Yamaha, Casio, Emerson, and some electric pianos bought online. The sound of electric pianos below 8000 is only proportional to the price, just like the sound at home. So far, this kind of sound can only be reduced by increasing the cost of accessories, but it cannot be completely removed.

Normal judgment: the volume knob is basically abnormal (power change) after being screwed to the minimum.

Abnormal: It is still abnormal to turn the volume down to the minimum.

1. Check the grounding wire at home. There are many problems with the grounding wire at home, which leads to a loud sound after plugging in the electric piano.

2. The electric piano can't be placed in a place surrounded by large electrical appliances. RF signals such as wifi routers, such as the RF signals of mobile phones answering calls, short messages and social software messages, will have different degrees of noise.

3. No matter how to debug the volume knob, the sound is too loud and beyond the normal range. You can ask where to buy an electric piano.