Yes, they work excellently for both data centers and concerts (speaking from extensive experience), unfortunately it doesn't look like they offer the larger size. :\
I would be into a pair with red/ blue flanges in large but I'm sure that's a long shot. (it would have to be a custom order)
I would be into a pair with red/ blue flanges in large but I'm sure that's a long shot. (it would have to be a custom order)