Speakers Static crackling

[Wolfy1091]

I have a kenwood 372bt. I just installed Jbl club620f  speakers and a stetsom amp. When I had it set up using the hu and car battery I get static and break up sound. When I hook it up to a separate battery and up to my phone directly it’s much louder and sounds perfect. I hooked my phone back up to it and left the car power hooked up and it still caused static and my right channel stopped working. Hook it back up to the sep battery and it runs fine. What could be the issue

i took the hu and amp out and set it up on my desk and it’s running fine. What could be causing the noise with it in the car?  Engine was not running

[Joe X]

You have grounding issues, check out the video to learn about the different issues:

 

https://www.youtube.com/watch?v=Q8dpucdxs6Y

 

 

If you can't find the issue go to a pro installer.