ACX Audiobook Spec Validator

Verify if your narrator master files conform to strict Audible quality controls. Drop your MP3 or WAV chapter masters below to test peak ceilings, RMS volumes, and sample rates.

Drag & Drop Chapter File

Supports WAV or MP3 chapter masters (max 200MB)

Browse File

ACX Audio Guide

Audible checks all submissions using automated scans and structural engineering tests. Any mismatch results in immediate file rejection.

01.RMS Limit ensures listeners do not need to constantly turn volume keys up or down during chapters.

02.Peak Limit guarantees zero digital distortion on phone speakers.

03.Noise Floor requires background ambient noise below -60dB (impossible in standard rooms without treatment).

Audiobook Narrators

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