I have a Ford Focus 2005 ZX4 ST, that has Sony Audiophile speakers, which come packaged by default with that particular model.
- I have not modified them since buying the car used, and everything looks standard AFAICT.
- The two front speakers embedded in the driver and passenger doors randomly will crackle (imagine radio static with the sound going in and out, or like when you don't have an audio cord fully plugged in for computer speakers)
- When I place my hand over the speaker cover, it feels "static-y" (hairs on my hair will stand up, etc).
What are some likely causes of the crackling, and how can I go about troubleshooting this problem?