I switched sub boxes and one of my subs do not work. I checked the wiring and used the voltmeter and everything checked out fine. I am not sure what is going on. Maybe its the wirirng from the dash to the amp? Are their any visual damages to a sub when it is blown?
My sub quit working all of a sudden one time. It was one of the wire's inside the basket. The wire just vibrated off, maby that's it. If your sub is blown, you'll know it. It will sound like crap. It will still play though.