A friend of mine has a Klipsch reference series speaker set. The sub, an RW12D, mysteriously stopped working. It had been working for the 1.5 to 2 years he's had it. He visually checked the fuse and it appeared to be darkened at one end. The other odd thing, which he cannot account for, was that the audio cable that was plugged into the speaker was unplugged somehow before he even checked the fuse. The speaker is in a place where the cable wouldn't get inadvertently tripped over by anyone or anything. He did replace the fuse now with a new one (same model as previous fuse). He has spoken with tech support and they suggested he replace the fuse. Unit does not appear to turn on as it displays nothing and the little screen does not light up. I know that it is possible to get replacement parts, but is it worth it? Even if we do find out what went wrong? It's a pricey sub so he'd rather fix than replace.