Depth

A spatial descriptor in audio assessment. The radial extent of source, scene or ensemble from the listener (in any direction away from the listener). A talker in a dry acoustic environment may be perceived as having little or no depth. A crowd in a stadium has depth. The sounds of the crowd are simultaneously occurring close to and far from the listener. Scale applied in listening tests: Shallow - Deep. [Reference: Report ITU-R BS.2399-0]