Human spatial resolution limits make stereo-to-multichannel upmixing perceptually plausible.

Evidence

One of the tasks in audio is to present a two-channel stereophonic audio track using more than two loudspeakers. In principle, it is not possible to derive more independent channels than there already are. However, when the low spatial resolution of humans is taken into account, stereophonic signals can be rendered to a higher number of loudspeakers with plausible results. — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 2170

Categorization

• XREF: Connects to psychoacoustics of spatial resolution limits familiar from soundscape and binaural literature.