What should I do if the stereo of the hand-cranked piano is noisy?

When the electric piano uses high-power speakers, there will be a slight current sound, especially in a quiet environment. When the volume knob is turned from the maximum to the minimum, there is basically no current sound, which is normal. If the volume knob is adjusted to the minimum and still loud, it is judged as abnormal.

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. Electric pianos should not be placed in places surrounded by RF signals such as large electrical appliances and wifi routers. There are also different degrees of current sounds in instantaneous RF signals such as mobile phones and receiving short messages.