It's rude to have the volume up too loud.
Harry is studying in his dorm room listening to music.
Harry wants to use the music to study more effectively.
Harry decides to put headphones on to block out all sound other than the music.
Harry turns the music up loudly on his speakers to block out any other distractions.
Harry concentrates on his work and his dorm mates continue to find him pleasant to live with.
Harry concentrates on his work effectively, but is given a warning the next day for his music volume.