Board Thread:General Discussion/@comment-24991718-20140726213036/@comment-33672157-20171129055121

Arngeir is the only Greybeard who can freely speak, whereas the other three Greybeards cannot even whisper without causing an earthquake. This is because he is the strongest of his fellow Greybeards (excluding Paarthurnax) and has learned how to control his voice and speak normally