Electro-acoustic products are often part of a listening experience composed of (a) an original sonic event, (b) the environments acoustics, which modifies the sound waves, and (c) the listeners brain with its unique cognitive psychology and cultural history.Because sound results from a mechanical event, radiating sound waves actually are broadcasting the events identity, location, and personal significance.An event might be a running elephant, a speeding truck, or a crying baby.We hear events.In addition, the acoustics of objects and geometries within the environment modifies the events sound waves as they move to the listener.From these modifications, the brain creates a picture of the external world.For example, the listener can aurally perceive a spaces volume, its textural qualities, and the events location in that space.Sound and space are tightly coupled, and together are given meaning by brain function.Hearing events and perceiving space are fundamental properties of the mammalian auditory system, whose long evolutionary history predates music and speech.In modern society, headphones, loudspeakers, cell phones, reverberation systems—all types of electro-acoustic technology—influence the brains picture of events and the environment.This interdisciplinary view provides a more complete understanding of the way in which electro-acoustic products relate to the phenomena of experiencing sound.