The United States Open added a new $150 million retractable roof before this year’s tournament, so fans inside Arthur Ashe Stadium no longer need umbrellas. They might, however, need earplugs.

Fans at the U.S.T.A. Billie Jean King National Tennis Center in Flushing Meadows have long been more raucous than those at the sport’s usually staid tournaments. But the retractable roof structure has produced new and unforeseen noise issues: Voices of fans in the upper reaches of Arthur Ashe Stadium, the showcase for the Open’s marquee matches, are reverberating off the roof and can be heard loudly and clearly down on the court during play.

The U.S. Open trailed behind the Australian Open and Wimbledon in adding retractable roofs to allow play to continue during rain, long a disrupter of tennis. The rain stays out now, but the noise stays in — creating an echo chamber and a much louder experience for everyone.

“Ladies and gentlemen, please, your voices are carrying to the court,” the chair umpire Eva Asderaki-Moore told the crowd Thursday night in one of her many pleas for silence.