It was the living room air purifiers. That would explain why my noise cancelling headphones can get rid of it, they work great for wind.
Got to leave those on though, they might help my allergies. Just turned them down to 2.
Easier to adjust my own subwoofer, without them on three anyways. I would turn the subwoofer off, on my receiver, and still hear the noise. Only notice the air purifiers though, when music or a show is on.
My oldest air purifier, kept turning off for some reason. Internet just said it might be overheating. I vacuumed it, but the filter wasn’t that bad, probably vacuumed the filter not that long ago. Bunch of cat hair on the outside of it though. Also moved it farther away from coffee table.
Be a bummer if that one dies. Then only one in living room. Suck more dust and hair up, with two. Probably won’t replace it if it dies either. Well, not with one that costs as much.
The noise from outside is obvious now.