I have 2 Apple TV’s that are dead silent. Have you tried complaining to Apple? Perhaps a different unit can solve the issue.
If you want to upgrade the streamer, try the usual suspects....Bluesound, HEOS, it depends on your budget and there are multiple threads here. Even if the Apple TV was replaced, it’s still a high jitter device with a poor DAC. I was running one of my units through its optical out into a DAC, but then I would have to disconnect that if I wanted to use the HDMI to stream a movie so that experiment didn’t last long
If you want to upgrade the streamer, try the usual suspects....Bluesound, HEOS, it depends on your budget and there are multiple threads here. Even if the Apple TV was replaced, it’s still a high jitter device with a poor DAC. I was running one of my units through its optical out into a DAC, but then I would have to disconnect that if I wanted to use the HDMI to stream a movie so that experiment didn’t last long