How do you know its blown? Only reason asking, I have put my sub setting to the max, and then have shut it off, I don't notice a difference.

I am wondering if its even working.

 

The subwoofer already went once already. They replaced it. Now it went again. I had sub-bass before, now I don't. I tested it carefully at different volumes, different subwoofer volumes, putting all the sound to the rear, etc. Sometimes a little bass comes out, sometimes nothing, sometimes a flutter/rattle.