Insanely loud buzzing from door speakers. Can't find the problem.

[RageQuitForLife]

So i've recently come across a problem with my speakers making an insanely loud buzzing noise. I don't have a separate amp for my door speakers, they are getting power from the head unit.

If i disconnect and reconnect my car battery the sound goes almost back to normal, but once i turn the bass up after about 30 seconds or more the buzzing sound comes back.

Before: https://www.youtube.com/watch?v=byhSK7-I1dM

After: https://www.youtube.com/watch?v=LzA8T4vq378

I've checked all of my connections and everything seems to be fine, but i can not figure out what the hell is making it do this.

please someone help, thanks