Are you asking the wrong question? You should ask the experts in the field of science and technology. They can help you!

Check carefully, find out the cause, and then solve the problem

Check whether the amplifier and audio are connected properly, and then check whether the attack and defense mixer and other equalizers are connected properly, whether the computer is connected properly, whether the mixer is connected properly, whether the computer is played, whether all the power supplies are turned on

If the operation is normal, you'd better go to the 4S store to check if there is a problem. There are many things left.

First, check whether the player host is powered on and open it! Second, check whether the player has a problem playing the audio source. It supports MP3. DTS format!

Check the data or plug

Are you asking the wrong question? You should ask the experts in the field of science and technology. They can help you!

Check whether the control panel keys and audio cable are normal.

Check the audio line to see if there is no sound due to line fault. Also, is the horn broken.