I recently purchased a new Nemesis na320 head and two used Bergantino ht112 cabinets. The second day after I bought it, it started crackling. I don't think that the speakers are blown because the crackling comes in and out every few seconds rather than a constant rattling noise. I also don't think that the speakers are blown because the cabinets together should handle 600 watts, the head is only 320 watts, and the highest I've turned it up is a little more than halfway. My knowledge about the way all this works is next to nothing, but I'm guessing that the problem is a connection somewhere. I really don't know what else to describe, but if anyone wants to know something more I'll happily tell you. Any thoughts on this are really appreciated.