FAA through the National Academies did a research study a few years ago [1] to provide guidance on improving the intelligibility of PA systems and also improvin

FAA through the National Academies did a research study a few years ago [1] to provide guidance on improving the intelligibility of PA systems and also improving the overall acoustics of airport terminals. The idea is that this guidance would be used for terminal renovations and new construction. It looks like they may have put this to use! (I was on the team but not an author of the final report). https://crp.trb.org/acrpwebresource2/improving-intelligibility-of-airport-terminal-public-address-systems/ https://crp.trb.org/acrpwebresource2/improving-intelligibili...