Katrune

Greetings all. I usually take very good care of my electronics. However, recently the subwoofer on my ProMedia 2.1 set has stopped working. The power works well, as my green indicator light is illuminated. The satellites are working as intended, as well. I never increase the subwoofer past the line on the right satellite. Any ideas what could be causing it?? Could a blown fuse (the one that is accessible on the back of the unit) be the issue?? Open to any suggestion.