Oh dear that is a lot of times, maybe you should've cured that cage squeak a while back lol. I guess the only things you can try are the things already suggested by yourself and others. They do seem to pick up those type of noises - such as sirens, smoke detectors, microwaves first. Beau does the smoke alarm quite often and that is LOUD and IRRITATING. I wouldn't have it any other way though, he is who he is. Maybe your hubby has acute hearing.
Maybe you could try recording it and putting it on here so we can hear just how bad it is, just a thought.