listening to this, it sounds like it would be from Larry as the drums are super up close. I could be wrong, but I've heard another Bono IEM and it doesn't sound like this, i'm referring to the Charlotte Elevation show as well as Nuremburg, I think, on Popmart. just wondering
I always thought it was from Bono per what it says in the Bootleg page on this site. But then your theory about the drums being so audible could be Larry's too...another idea could be that it may be a mix of two different IEMs - being Bono and Larry. I'd be quite interested to hear for myself the actual source so we can get a better idea.
Information from Achtungbootlegs.com
Material: Commercial bootleg IEM + audience recording matrix by diggitydog