Yep. I hear ya Doc. The C-5's here have a very specific growl as they pass overhead. You can hear the engines change as they prep for landing.
I'm about 10 miles out.
When they're taking off in my direction, you usually hear the warbirds. Those things tend to roar for a couple minutes or so after they pass over head (Pratt & Whitney / GE Aerospace at work). Plus, they tend to be standing on it to gain altitude.
The BIG birds will slowly hum by, not too much louder than a civvy airliner. It's kinda amazing how "quiet" those things can be on take-off. But then be so fukin noisy during a standard landing. They'll scream as they pass overhead during landing.