New here first post. I've got a 2000 volvo s40. A few months ago my front speakers started buzzing, and I lost all audio. Rear speakers worked fine and still do. Decided I would replace the head unit with something a little better. Installed a Kenwood unit and gained my audio back in the front. The only issue is that at medium to high volume there is a popping/buzzing/overall distortion. Mostly durring snare/bass hits. Keep in mind, the speakers are stock, the headunit is not. Today I thought, "hey maybe the speakers are blown" so I installed some Pioneer tweeters and to my suprise!!!! they pop too, no use. So basically my issue is that my front speakers are popping and buzzing at mid to higher volumes. REAR SPEAKERS ARE FINE!