Use the anechoic specs as the baseline as they are non speculative. 96db in room is best possible scenario.

Take a pair of speakers and temporarily hook them up in this "metal barn" and compare them to what they sound like in a standard living room. Any room problems if they are real should be noticeable especially at increasing volumes. A metal barn (metal walls and floor?) sounds like a dreadful, overly reflective and fatiguing listening space for expensive speakers.

I’m armed and I’m drinking. You don’t want to listen to advice from me, amigo.

-Max Payne