Sledgstone

I was listening to some music on my PC while I was working earlier today and after a while I shut the stream off. About 20 mins later my speakers abruptly starting making loud low noises like a test pattern. I shook the speaker a bit and it stopped and I turned the power off on them. I kept working and another 5 mins later I smelled burning plastic.. and then smoke coming from my speaker.. wtf. It only stopped burning after I unplugged it from the wall. I don't know if the speaker caught fire because of a component in it, or if the ac adapter kept failed and kept pumping electricity into it. I'm glad I was there when it happened or it could have caused a serious fire incident. Now I'm paranoid about my other electronics catching fire on me. x_x