Understanding the tech specs related to loudness is important, but the reason Netflix wrote its own specs is interesting too! You can download Emotion Systems’ Guide to Audio Compliance for Netflix Content here.
Established measurement methods have allowed titles with subaudible dialog to pass spec if they also included loud FX and music content that balanced it out. Believing that its audiences adjust volume in order to better hear and understand dialog, Netflix effectively wrote a spec to make dialog the anchor element – and Emotion Systems’ guide explains how, with helpful technical detail.
You’ll also find useful information on how you can ensure your complete mix is compliant and all set for Netflix and its audience.