I just bought a new JVC head unit and new speakers to replace my front and rear stock speakers. I also bought the JVC aux input adapter that plugs in the CD changer port. Everything worked fine for the first week but this morning i get in my car, plug in my mp3 player, press play, and hear distortion coming out of all 4 speakers. Its sounds bad on the low tones of the song similar to how a speaker would sound if it was blown. I also tried putting in a CD and listening to the radio but the distortion was still there. Any ideas on what this could be?