The noise pumping through the speakers inside the Eagles' practice bubble was so loud it could be heard nearly a mile away in the streets of south Philadelphia.
They're getting ready for Seattle.
The Eagles (5-4) visit the Seahawks (6-2-1) on Sunday so they spent Thursday preparing for the NFL's loudest fans known as the "12s."
"It's really hard to totally simulate this environment, but that's the fun part of it," offensive coordinator Frank Reich said before practice. "When you've been around this league and you kind of get in environments like this, as challenging as it is, it's fun."
For rookie quarterback Carson Wentz, it'll be his toughest challenge on the road yet. The Eagles have lost four in a row away from home and Wentz has struggled in the first quarter in a few of those games.
"This will be a good experience for Carson," Reich said. "You look forward to it, but you've got to keep your poise. You've got to really be able to bounce back from a bad play. You've got to have the fortitude to get back up and just stay aggressive."
Wentz threw two interceptions on the first two possessions in his previous road game against the Giants.
The Eagles fell behind 14-0, but had an opportunity to take the lead in the final minute when they had first down from the New York 17 only to have Wentz throw four straight incomplete passes.
"I think the biggest thing is you need to communicate a lot," Wentz said about the crowd noise. "You need to work on hand signals both with the O-linemen and the receivers. You've got to work through a lot of those things.
"But those are things we've done already. Obviously, it will be louder, but if you already have those set in stone, I don't think it should be too big of an effect."
Eagles coach Doug Pederson grew up in Washington and went to Seahawks games at the old Kingdome.
"It's a great fan base up there," Pederson said. "I've experienced it firsthand from a fan's perspective as a kid in high school. They are passionate about it and they love it and they take pride in it.
"The way that stadium is designed and built with that cover right there, everything is kind of right on top of you and it's a great atmosphere."
The Eagles have 15 false-start penalties in their first nine games, including five at home last week in a win over the Falcons . It's imperative for the offense to use a silent snap count because the offensive linemen and receivers probably won't hear Wentz.
"A point of emphasis this week for us obviously is to be able to handle that and minimize those penalties," Pederson said.
NOTES: WR Dorial Green-Beckham has no catches in the past two games despite playing 93 snaps. He wasn't even targeted once vs. Atlanta. Green-Beckham made it clear no targets doesn't mean he's not open. "I'm not frustrated about it," Green-Beckham told The Associated Press. "If you look at the film, there are plays where I'm open, but other players are open on the same play, too. I just keep working hard."