Just in the one ear.
Which causes a kind of disorientation akin to having just one ear boxed but without the discomfort.
I have this all day but in both ears.
Apparently people can go crazy from this... i've had it for years... i'm thinking i'm already crazy as i'm so used to the constant ringing that i need it to sleep...
Yup.
Spoiler:
If you work around loud noises, it'll get worse as you get older. A lot worse.
When you get to be my dad's age, after six decades of explosions, gunfire and loud factories, it'll be louder than any normal external sound.
Man, that'd be crazy. Imagine hearing massive French Horns in your ears 24/7. Would you even be able to adjust to it, or would you constantly hear the boom?