One of the spookiest experiences of my life was activating a pair of noise-canceling headphones in a room that was already quiet and immediately being able to hear my neck vertebrae touching. I snatched them off my head like they were a spider.
I think that’s normal. I also hear that roar that you read about when yawning or twisting ear muscles, and also pushing my head forward with my hard while fighting back with my neck muscles.