It seems like that might be the case that there is more treble in the 30's. Soundstage wise I don't feel like there's much if any difference (as expected since it's a monitor, also, memory is really unreliable). Even though it had been a long time since I heard the UM3X I felt like the treble certainly has more energy in the UM Pro 30's than the UM3X, but unfortunately I haven't been able to A/B. I wouldn't be opposed to sending someone my UM Pro 30's to do a direct comparison. I've been kind of holding off on impressions and things based on the confusion over whether or not they sound the same as the UM3X. I also don't think my friend will be in town tomorrow, but I will find that out tomorrow.
Appreciate your time and energy in defining the UM30 tuning truth. I'm very curious myself. I also wonder if the new W series is voiced any differently.