"Sound is reciprocal, which means that if the source of a sound and a listener swap positions, what the person hears is unchanged." I don't see how that can be

"Sound is reciprocal, which means that if the source of a sound and a listener swap positions, what the person hears is unchanged." I don't see how that can be true. The physical dimensions and acoustic attributes of a space mean that a sound source will sound different depending on where it's located. As an example, if you have a room shaped like a horn, and the source is at the small end and the listener at the large end, you'll get a completely different result by swapping the positions of source and listener.