Binaural beats can not only be observed at headphone experiments, they can also appear when presenting two different pure tones via loudspeakers. The perceived sound is quite similar: There are auditory events, which move through the room, at low frequency differences, diffuse sound at slightly bigger frequency differences and correctly localized sound sources at bigger frequency differences.
So binaural beats give information about the signal processing strategies of the auditory system. Binaural analysis methods, auditory time constants, cocktail party processing can be investigated with the help of binaural beats.