Check your audiobook recording against Audible/ACX requirements — RMS, peak, and noise floor — before you submit.
Drop your audio file here, or click to choose
WAV or MP3 · Your file is analysed locally and never uploaded
My audio cleanup service masters your narration to ACX spec — noise removal, RMS & peak correction. Preview before you pay.
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How accurate is this?
RMS and Peak are exact — measured from the decoded audio, the same samples a DAW reads. Noise floor is an estimate (the quietest room-tone sections of your file); include a couple of seconds of silence for the best reading. This is a pre-submission guide to catch problems early — ACX's own QA is always the final word.
Not targeting ACX? The RMS, peak and noise-floor readings are universal level checks for any project — only the −23/−18 dB, −3 dB, −60 dB and 44.1 kHz targets shown here are ACX's spec.
Authentic West African English narration, and ACX-ready audio cleanup with a free preview.
Audio Cleanup Hire for Audiobooks