Alright guys, simple question here, I'll explain as best as I can. I used to use a Carvin probass 300 for a little while for gigging. For those unfamiliar with it, it is an older model combo amp from Carvin with a single 15" woofer, high frequency tweeter, and 300 watt bi-ampable head. It was used when I was relatively new to bass and gigging so I didnt understand how to properly eq or to get decent volume out of it, so I boosted most frequencies to make up for being overpowered by the rest of the band. At the last gig I played it with (about 8 months ago), it started cutting out about halfway through the show. It didnt turn off, the sound just came and went. I thought it might have been a cable, so I tried new ones with no luck (both speaker and instrument). My basses are all fine as well. No effects were in the chain either when I've used it. So I let it sit for many months and used different amps. When cleaning out a storage shed I had the other day, I picked it up and brought it back to my place to try it out again and now it works, but not properly. I havent tried it at high volumes again, but at low volumes it basically just sounds like I'm using some sort of distortion or fuzz effect, and am getting about 1/10 of the volume I used to get out of it. All of my other equipment is in top notch condition (all basses and cables), so I know the problem has to lie with the Carvin. Everything is currently set to flat, and the volume is at about 9:00. Is the speaker blown, or perhaps some sort of fuse? I know next to nothing about amp work, and would love to use it again (not to mention give it back in the condition I originally borrowed it in)? What am I to do?