Four mic-speaker pairs can transform a room’s perceived acoustics into a hall.

Evidence

It consisted of four microphones and loudspeakers strategically located, all controlled by a digital processor. When one walked into the room, one was in a “hall”. — Toole, Floyd E, Sound reproduction- the acoustics and…, 867

Categorization

• XREF: connects to: Loudspeakers and rooms function together as a single audible system; Listening rooms impose their own acoustics on top of recorded sound — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2278; Reverberation enhancement can transform a home theater into a concert hall seamlessly (+1 more)
• yield-rescued: below the book’s yield-target cutoff, included anyway for connecting to: Loudspeakers and rooms function together as a single audible system; Listening rooms impose their own acoustics on top of recorded sound — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2278; Reverberation enhancement can transform a home theater into a concert hall seamlessly (+1 more)