Why does my Speaker have a shaky low tone

My LG Stylo 5 isn’t sounding good. I plugged in an aux cable to a home theater and since then my speaker has a very low cracky sound, I can’t listen to music or videos. Pls help me! My LG Stylo 5 isn’t sounding good. I plugged in an aux cable to a home theater and since then my speaker has a very low cracky sound, I can’t listen to music or videos. Pls help me!