I haven't been to this site to post anything nor played bass for a while. It sucks that the first post I put up in a long time has to deal with amp problems. Anyway, I have a Hartke HA3500 head connected to Avatar 4x10 and 1x15. It has been sitting in my house for awhile untouched basically b/c I go to college and don't live at home anymore. But today I decided to plug it in a play a bit and to my luck, I get this disgusting fuzzy, distorted, muffled sound from my amps. I changed wires thinking that was a cause. Nope. I tried messing around with the settings. Nope. But I believe it's the Hartke head that is the problem. The back of the head, near the vent was extremely hot after only about five minutes of having it on. Does anyone have any insight into my problem?