So, I'm trying to do some reading on the Kramer Forum series. I really can't find much about the specs and whatnot. I'm looking at the Forum III and IV series, and I'm not sure what the deal is with them. What body woods are they made up? Do the ones that have 4 knobs feature preamps? All I see is "Spector active pickups", but I do sometimes see mentions of preamps. I know the Forum I and II have preamps, but I'm not sure about the III and IV.