Spec References

Audio Delivery Spec References

The technical requirements of the major delivery platforms, verified against the official sources and kept current. Every page carries a last-verified date.

ACX / Audible

ACX Audio Submission Requirements

RMS level, peak, noise floor, MP3 format, room tone and per-file consistency for audiobook delivery.

EBU R128

EBU R128 Loudness Requirements

-23 LUFS in EBU Mode, -1 dBTP true peak, LRA descriptor and the shortform variant for European broadcast.

Netflix

Netflix Audio Delivery Requirements

Dialogue-gated -27 LKFS, the 15% low-dialogue fallback, -2 dBTP true peak and format requirements for near-field mixes.