Learn Hardcore Russian: Из-за шума в коридоре я не расслышал вопрос толком. - Because of the noise in the corridor, I didn’t properly hear the question.

A useful extra note: из-за often introduces a cause, especially one with a negative result, so it fits very naturally with noise causing a problem.

It can also mean from behind in other contexts, but not here.

Why is it в коридоре and not в коридор?

Because this phrase describes location, not motion.

в коридоре = in the corridor / hallway
в коридор = into the corridor

With в:

where? → usually prepositional case: в коридоре
where to? → usually accusative case: в коридор

So here the noise is located in the corridor, which is why Russian uses в коридоре.

Why is the verb расслышал and not just слышал or услышал?