I was using my sub fine last week, but when I tried watching LOTR today it seems no sound is coming from the sub. It turns on fine, but nothing comes out. It's a Jamo sub 650 from Vanns, but I bought it about 40 days ago so I don't think I can return it to them. Does anyone know what I can do? Do I have to call Jamo or did I just get screwed...?