I'm not trying to persuade anyone, or cause an Argument, they don't need to swap the Armatures because the armatures they use are Wideband and will produce the required frequencies, they just needed to modify the x-over (if they actually have modified the IEM in any way) and if they have modified it in any way, meaning if they've had to reconfigure the x-over this late after the release then you'd have to fire the Engineer for not designing it properly in the beginning, Unless the EE had no experience with Sound X-Overs or phonics.. it honestly doesn't make sense, they already went to all the trouble, they wouldn't have designed the xover incorrectly.. unless they rolled the upper mids off a bit late causing some issues in the higher frequencies which would have been corrected with a few proto trial units. It would be almost a certainty they made a few and tested them first. All they would have to do - IF they have changed anything it is Tweak the X-over to Tighten up the Slopes where one driver drops off and the next responds. no need to change drivers, but they can change the poster which is keep it the same and just point to the other BA in the poster and give it a name like "Mid driver" that is essentially just saying "that now has more mid emphasis" the reason I think they just Changed the poster and not the IEM itself is because The first poster is Ambiguous. what the new poster looks like to me is what the the original poster should have been. if i'm not making sense.. let me know. Cheers