FWIW, a few years ago I was at a craft fair. One vendor had a Harbor Freight Predator generator (open frame). It was running a couple small refrigerators and a few lights.
It was really not loud and annoying, I was surprised at how quiet it was while running.
You didn't say how you want to use the generator.
Yes, it would be very annoying at a CG but for general use or emergency use at home it would be acceptable.
I'm sure a Champion is as quiet or a little quieter than the Predator.
I have a Wen 5500 open frame, it's rated at 82 db. It's loud.
