You don't know shit dude. I know he used a wizard in the studio, that's no secret, but Dimebag sure as hell wasn't playing thru any Marshall's unless they were for his clean tone which he is known for using tube amps for his clean tone live. I've seen them on the stage with him before too, but they belonged to another band, simple as that. Dimebag played thru Randall's, then Krank live for his main rhythm tone. He didn't lie about his shit.
You ever see the Dimebag clinic video from 1993? you see him playing thru a carpeted Randall rg100es head in the video and guess what, he sounded exactly like Dimebag.