Some people are just more sensitive to sounds, my son and I are both like that. I live in a rural town and it does stress me out when my roosters crow because I truly do not want to irritate my neighbors. However, the overall feedback has been that they either don't hear them or really enjoy them. I have two roosters and when they are both crowing non-stop, let's just say they are lucky I don't eat chicken. I think it irritates me more than anyoneMy neighbour is on the same work schedule as I am...up at 5am and get home from work around 5pm. The coop is about 100ft away, so it is relatively close to them. I'm not sure why it bothers her so much, because she gets up around the same time as me. But she says that she tries using ear plugs and nothing helps. This is the same neighbour who can't sleep sometimes because of highway noise (which I can't even hear except for the occasional logging truck) so I think she might be a little over dramatic. All I can do is respect her wishes the best I can without giving up the roosters. When they go off in the morning its only for 5 minutes or so, and the sound if fairly muffled now cause they're in their coop. Ah well, wish me luck. I'd rather not make an enemy with my neighbour, but we'll see how things go...
Could you possibly insulate your coop to dull the sound a bit more? Or put a black out shade up so your roos don't start crowing as soon as the sun comes up? Your neighbor is going to have to deal with some noise and it is commendable that you want to do what you can to improve the situation. I would try my best to keep them quiet during normal sleeping hours but beyond that she should be able to handle a bit of crowing. Assuming she is a somewhat reasonable person, it might be helpful if you asked her what times the crowing bothers her the most and then make an honest effort to keep them quiet at those times.