I see varying accounts online. The design of the structure, with a dome or partial covering matters. According to the link below the sound reflecting in Seattle is the reason theirs is the loudest, while not a dome, it has a ceiling in the ideal locations. THere are lots of factors that are not apples to apples such as how much the fans get into making noise, that is different with different fan bases.
https://keepingscore.blogs.time.com/2013/09/17/the-science-of-sound-how-seattle-got-so-darn-loud/