Guides for Audiobook Creators
A library of 6 guides on ACX submission, rejection fixes, and getting your audiobook ready to ship. Written for narrators and indie authors.
ACX Specs & Rejections
ACX Audio Requirements: RMS, Peak, Noise Floor (2026)
ACX audio requirements explained: RMS, peak, noise floor, format, sample rate, silence. Plus how they compare to INaudio, Authors Republic, and Google Play.
ACX Rejected Your Audiobook? Fix Every Issue
From ACX rejection email to fix, without uploading your file. Loudness, noise floor, true peak, format. Files stay in your browser.
Audiobook Noise Floor: What It Is and How to Fix It
Why boosting loudness pushes the noise floor above ACX's -60 dBFS and why gating works where noise reduction fails.
Tools & Workflows
Audacity Audiobook Mastering: Full ACX Workflow
The exact Audacity effect chain for mastering audiobooks to ACX spec. Noise reduction, compressor, normalise, limiter, and the batch macro.
Best Audiobook Mastering Tools Compared: 2026 Guide
Honest comparison of Audacity, Auphonic, Hindenburg Narrator, Source, and ChapterPass for ACX audiobook mastering. Features, pricing, trade-offs.
What ChapterPass Does (and What It Does Not)
ChapterPass masters audiobook files to ACX spec in your browser. No account. Files never uploaded. First file free. Honest scope and what it does not do.