Some chickens just do seem to be louder than others.
Maybe rehome or butcher the loud ones, and replace with another breed?
Or plant lots of bushes around the chicken coop? Enough leaves can make a big difference to how far the sound travels.
Are they doing the "egg song" or just talking loudly all day? If they just have a lot to say, they might be quieter if you give them more things to do. (I'm thinking something like a compost pile or a mound of dirt to dig through.) But even if they will be quiet with something new to scratch at, it can be difficult for you to keep providing new things for them, so you still might want to consider replacing them.