Even though they are supposed to have the same pre-amps, I think the Terror has an active EQ which is supposedly flat at 12 o' clock, whereas the AD200B is supposed to be flat with treble at 9 o' clock, mids at noon, bass at 3 o' clock (I think).
Also, some people say 10 to be the max setting rather than using clock positions which makes it hard to know what they're referring to when talking about settings!