KANSAS CITY, Mo. (AP) — Arrowhead Stadium is once again the loudest stadium in the NFL.
This time, it's official.
The Kansas City Chiefs broke the world record for an outdoor sports stadium in their 24-7 win over Oakland on Sunday when they reached 137.5 decibels in the closing minutes.
An official from Guinness World Records told The Associated Press that Chiefs fans broke the record of 136.6 set by Seahawks fans during a game against San Francisco earlier this year.
To put that in perspective, a jet engine at 100 feet is about 140 decibels.
"I had people who'd been coming to Chiefs games for decades come up to me and say, 'I've never heard it that loud,'" said Chiefs chairman Clark Hunt, whose family's franchise has long claimed that Arrowhead Stadium is the loudest in the league. "It's very difficult for a team to play in that."
That may be an understatement.
The Raiders struggled with the reverberating sound all afternoon, and were whistled for 11 penalties — several of them were false starts and for delay of game, simply because nobody in the visiting huddle could hear each other talking.
"It was a tough environment," Raiders quarterback Terrelle Pryor acknowledged.
The record-setting attempt was planned by Chiefs fans but had support of the organization, which paid $7,500 to fly an adjudicator from Guinness to Kansas City to document the effort. It turned out to be Philip Robertson, who also was on hand when the Seahawks set their mark.
"They destroyed any Premier League hopes of attaining this record, I can tell you that, and I'm a Brit that loves the Premier League," Robertson said. "It was extraordinary."
Robertson said that the sustained level of noise inside Arrowhead Stadium was greater than at CenturyLink Field, when Seattle set the record. But all that matters for the record books is the peak volume, and it appeared as if the Chiefs were going to come up short as the game wound down.