AES Europe 2025

This presentation focusses on side and rear channels in recordings in Dolby Atmos. At present, there is no standardised placement for side or rear speakers. This can result in poor localisation in a major portion of the listening area. Sometimes, side speakers are at 90° off the centre axis, sometimes up to 110° off axis. Similarly, rear speakers can be anywhere 120°-135° degrees off axis; in cinemas those can be located directly behind the listener(s). However, an Atmos speaker bed assumes a fixed placement of these side and rear speakers, resulting in inconsistent imaging. Additionally, placing side and rear speakers further off-axis results in a larger gap between them and the front speakers.

These inconsistencies can be minimised by placing these objects at specific virtual locations, whilst avoiding the fixed speaker bed. This ensures a listening experience which represents better what the mix engineer intended. Additionally, reverb feeds can also be sent as objects, to create an illusion further depth. Finally, these additional objects can be fine-tuned for binaural rendering by use of Near/Mid/Far controls.

Mr. Bowles will demonstrate these techniques in an immersive playback session.