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Abstract waveform and loudness-meter motif in indigo and cyan representing audiobook audio mastering
HomeBlogTutorials

ACX Audio Specs: Master an AI Audiobook That Passes QA

A step-by-step guide to mastering AI-narrated audiobook files to ACX's audio specs so your submission clears QA on the first pass.

AudioPod Team
•Tutorials•July 14, 2026•8 min read

🎧 Listen to this article

On This Page

0%
  • What does ACX actually measure?
  • Step 1 — Generate the narration in chapter-length blocks
  • Step 2 — Add room tone at the head and tail
  • Using ffmpeg to add 0.7s lead and 2s tail of silence
  • Step 3 — Normalize to the RMS window
  • Measure current loudness first
  • Apply loudness normalization targeting the ACX window
  • Step 4 — Check the noise floor
  • Isolate the first 0.5s and measure its RMS
  • Step 5 — Encode to the final MP3
  • Which tools handle the mastering automatically?
  • FAQ
  • Get the narration right first

Tags

#audiobook#acx#audio-mastering#self-publishing

Share this article

On This Page

0%
  • What does ACX actually measure?
  • Step 1 — Generate the narration in chapter-length blocks
  • Step 2 — Add room tone at the head and tail
  • Using ffmpeg to add 0.7s lead and 2s tail of silence
  • Step 3 — Normalize to the RMS window
  • Measure current loudness first
  • Apply loudness normalization targeting the ACX window
  • Step 4 — Check the noise floor
  • Isolate the first 0.5s and measure its RMS
  • Step 5 — Encode to the final MP3
  • Which tools handle the mastering automatically?
  • FAQ
  • Get the narration right first

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