Spaciousness comes from natural room reflections, recorded multichannel reflections, or both.

Evidence

Thinking ahead, those reflections can be the natural reflections of loudspeaker sounds in the listening room, reflections included in a multichannel recording and reproduced through one of several loudspeakers or, as will inevitably be the case, a combination of the two. — Toole, Floyd E, Sound reproduction- the acoustics and…, 701

Categorization

• XREF: Ties directly to why spatial impression from lateral reflections can be captured in multichannel recordings rather than only coming from room acoustics.