About a year ago, I received a Denon DSW-80 8" subwoofer from a friend. The sub was brand new. The other day I noticed no bass coming out of it. The light on the back used to be green, but is now red and won't turn green after I power it off and back on. I checked the fuse and it looks ok. Has anyone ever experienced a similar issue with a denon sub in the past?

Sorry, it's actually a DSW-80, not a DS2-80.