The sound system in my sister's '03 LX Accord makes a buzzing noise now, and I was wondering what the problem could be? I think it's a blown speaker, but I'm not totally sure. Is there any way to diagnose which speaker is blown?

 

It could be bad grounding wire, if it is an aftermarket system chances are it could be the grounding wire....

 

It could also be something called road noise which is not only related to ground wire but also positive wire. This happens when wire is contacting a metal surface or being pinched to one. You could also have a bad driver (speaker). I wish I would know where the problem is but this is a VERY broad question. Mind you, if you find the problem go to a radio shack or something and buy a ground loop isolator and splice it on in.

 

I'd definitley say a bad ground. If it's an aftermarket speaker see if it is touching the body at all.