I got two RE HC 15's recently and yesterday I could tell the bass wasn't as loud anymore. I checked them out and one sub wasn't playing. I tried pushing down on the cone and it wouldn't even budge. So I take it out the box and see that the basket is loose from the motor. The cone will move now and I tried wiring it up to see if it worked and both coils played. I can see where there are a few screws from the motor that go up into the basket. Is there any way I can tighten these or does this sub have to be reconed?