E-AC-3 (Enhanced AC-3), branded Dolby Digital Plus, is the streaming-era successor to AC-3, used by Netflix, Disney+, Apple TV+, Amazon Prime, and ATSC 3.0. It is more bitrate-efficient, reaches higher rates, and supports more channels, so 5.1 and 7.1 stream comfortably at a fraction of AC-3's bandwidth. Its most important trick is Joint Object Coding (JOC), which layers Dolby Atmos objects on top of a 5.1 core — this is how immersive audio actually reaches most living rooms today. E-AC-3 is widely hardware-decoded across TVs, mobile, and set-top boxes, making it the practical default for premium streaming surround.
The book · Volume 4 of 7
Audio for Video: A Complete Guide to Sound in Video Products: From PCM and Codecs to Loudness, Accessibility, and Real-Time Voice Processing
E-AC-3 is what premium streaming services ship for 5.1 and 7.1, so device support and bitrate choices for it shape your audio offer. Volume 4 covers audio codecs in detail, along with channels and layouts, loudness and LUFS, so you can plan E-AC-3 surround delivery next to an AAC stereo fallback. Written by Nikolay Sapunov, CEO at Fora Soft.
Adding E-AC-3 surround to your streaming service and unsure which devices will play it?
We will map E-AC-3 support across your target devices and send an audio delivery plan with bitrates and AAC fallbacks. 250+ video products shipped since 2005.
