Seahawks 12th Man and defense present 49ers with tough test

Hear that?It’s been there for every offensive snap of the 49ers’ season.Every time Brock Purdy calls out the play in the huddle, each adjustment he makes at the line of scrimmage, it’s there.Silence.Between their owner’s arrest, their coach’s car crash and all the doubts surrounding their age and health, the Niners have tuned out the noise to an impressive degree to begin the season. But there’s one thing they haven’t had to deal with.Actual noise.The 49ers may have already logged almost 16,000 round-trip miles in the air, but they haven’t used a silent count on offense once.

They’ve played three home games and effectively a fourth on the other side of the world.But that’s about to change Sunday.  Kyle Shanahan had better hope his team hasn’t gotten too comfortable operating in front of friendly crowds.

Because it’s about to get real hostile, real fast.There is potentially no larger contrast between the docile environs that have greeted the 49ers through their first four weeks and the wall of noise awaiting them inside Seattle’s Lumen Field.Talk about being thrown into the deep end.The biggest news, opinion and culture shaping California right now.

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Never miss a story But the Niners are eager to show they can swim in the choppiest conditions.“It’s always a good test,” running back Christian McCaffrey said.“You know, super-loud stadium, hostile environment.

Obviously [a] division opponent, so it’ll be a good test for us.”“Their stadium,” added linebacker Fred Warner, “is one of those places where it’s going to be hostile.”Seattle’s fans are so notorious they have their own name.The stadium is home to some of the most haunted memories in 49ers history — but also some of their greatest glory.Warner and John Lynch fondly recalled this week the final week of the...