car speakers acting up?

I just recently got a new used car and my right side speakers are acting wierd. They are nice infinity speakers and i dont think they are blown because this only happens every now and then and when its not messing up, they sound fine.
but every now and then, my right side speakers make a very loud buzzing sound and is not effected by the volume knob.the only way to make it stop it to turn the radio off. sometimes when it is working normal, if i turn the volume down, i can hear a faint crackling noise.the wierd thing is the speakers still sound fine.
I think it may be a loose wire. how could i fix it.how much would somewhere charge to fix it?

The volume knob does not effect the volume of the buzzing,
its only on the right side,possibly only the front door
 
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