I just purchased a used Depth sub from Audiogon. When I first got it, I hooked it up to my existing system. I have a new set up coming but don't have it all yet. The sub worked fine. Then several days later I noticed that there was no sound coming out. I checked the fuse and it was blown. I don't remember doing anything that would have taxed it at all, so I'm not sure how it blew. Anyway, the sub will not work after replacing the fuse and changing the power cord. I'm new to ML and higher end A/V sytems in general. Does anyone have any ideas? It seems like it is something internal. I hadn't moved it between setting it up and it not working. If anyone can help me out I would appreciate it.