The Apple Watch Series 10 launched in September as Apples latest flagship model, and theres a lot to love about it. Since then, however, a growing number of reports have highlighted a potential hardware issue with some units that affects the built-in speaker. Heres what you should know.Users report Series 10 speaker volume is unusually lowAs outlined by various Reddit and Apple Support threads, some Apple Watch Series 10 users have discovered they have a defective speaker.Affected users say that they will set their Apple Watch to max volume and can still barely hear whats coming from the built-in speaker.In some cases, the issue seems to have come on graduallytheir Series 10 speaker started off fine, but degraded over time. Others, however, seem to have had issues right from the start.The speaker issue affects volume across all Watch functions, such as playing music or podcasts, making phone calls, and more.You can find reports on Apples Support Community here and here, plus in various Reddit posts. For example, this Apple Support thread includes the following replies to the original poster:Im having the same problem with my Apple Watch 10. It is my 4th apple watch and I never had a volume problem with the others.I have had an Apple Watch for YEARS and have had NO problems. Then I got a new Apple Watch Series 10 in November 2024 and by December the sound was so low you couldnt hear it when it was on full volume.Same problem: My new Apple Watch 10 at maximum volume is nearly inaudible.Same here. Speaker is low playing back voice memos, too. I have the volume cranked. Its insane how I cant hear it at that setting.Apple has not yet officially acknowledged a hardware issue with the Apple Watch Series 10. But well keep you posted on any further developments in this space.Have you had issues with your Apple Watch Series 10s speaker? Let us know in the comments.Best Apple Watch accessoriesAdd 9to5Mac to your Google News feed. FTC: We use income earning auto affiliate links. More.Youre reading 9to5Mac experts who break news about Apple and its surrounding ecosystem, day after day. Be sure to check out our homepage for all the latest news, and follow 9to5Mac on Twitter, Facebook, and LinkedIn to stay in the loop. Dont know where to start? Check out our exclusive stories, reviews, how-tos, and subscribe to our YouTube channel