Crowd what?

players cant hear anything they have white noise in those big ass headphones on top of their IEMs

vibrations

the mics

they can feel rumbling and the crowd faintly getting picked up from teammate's mic

current players have said they can still hear through their teammates mics

it is highly unlikely they hear anything or even feel the crowd, when a player is focused on stage in their flowstate no way they register what crowd is doing

I guess we gotta wait for TacticalRab's video on this matter.