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At 400ft up, you're not going to hear a thing. Would wager that even if I told you it was there you would not be able to locate it in a timely manner, let alone be annoyed by it.

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At 400ft, you can't really hear a modern car on modern pavement. But you certainly can hear a busy street.

One single drone may not produce a lot of noise but a whole group of them might be a different story.

Isn't 400 their max ceiling by regulation? Presumably they don't want to breach their operating rules so actually fly somewhat below this?

Probably, but I am unsure what part of the regulations they are required to follow. I'm more familiar with human operator/FPV drones, mainly racing quads. Even if they're only flying at 300ft to be safe I still very much doubt you will hear anything. My race quads are pretty loud but in my experiences with larger slower moving ones they can be pretty quiet once a short distance away from you is reached. Mostly attributed to the props being larger, slower spinning, and less aggressive.

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