I can only hear my neighbors music below me because of the bass and I am very sensitive to bass. I can also hear the music next door when he plays it loud enough and his loud TV when I am in the bathroom but not so much when I am not in there.
I also realized recently that I bet no matter how low my neighbor plays his music, I will still hear it because of the bass and he likes bass. My husband doesn't want me complaining to our landlord because he thinks it will cause too much trouble and we be kicked out. Back when his brother still lived with that neighbor, I have heard them fight a few times.
I can hear pretty much everything in the hallway but not in my own apartment. I can hear doors open out there and people talking or going up and down the stairs and the neighbor's kids. They like to scream as they go outside but thank goodness they don't do it often nor do they stay in the hall.
Back before the neiohbors moved in below me, there lived a lady and her teenage son. I would sometimes hear her have sex because the bed would hit the wall. My husband would hear her scream but I never did. I also heard her music because she played it a little loud but it never bothered me because there was no bass.
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Son: Diagnosed w/anxiety and ADHD. Also academic delayed and ASD lv 1.
Daughter: NT, no diagnoses. Possibly OCD. Is very private about herself.