i know nothing about speakers and so i have two ?s for any to answer. One of my front speakers rattles when i turn the volume up why is that. Next i have a accord '02 and i want to upgrade my system in the car all i want is to get some better speakers for inside the car and a 12inch sub to put in my trunk what else will i need to run that and does anyone know how much that will cost me?

 

The rattling could be a couple of things, but I would check to make sure the speaker is tightly screwed down and that the speaker cone/surround isn't blown.