I own five base model M1 Airs that are Space Gray and a sixth that is silver. No speaker issues thus far. There was an audio/notifications glitch in Apple Silicon versions of Monterey and version 13.0 in Ventura (thankfully they finally fixed it in 13.0.1) that sounded like a speaker problem, but it wasn't. But that problem persisted across multiple kinds of M1 Mac that I've operated (iMac, MacBook Air, Mac mini, MacBook Pro, etc.).