I recently acquired a pair jl 12" subs. One has a surround that is completely ripped all the way through. The other surround is ok but old. I ordered new surrounds thinking I would just redo them both but then it dawned on me that if it was run with the surround ripped, then the motor could have touched the magent and blown the speaker. Is there any way to test the speaker without refoaming it just to find out its blown?