How to Narrate Audiobooks on ACX

If you want to learn how to narrate audiobooks on ACX, the process breaks into three parts: get accepted and audition, record to ACX’s technical standards, and deliver finished, mastered chapters. ACX (Audiobook Creation Exchange) is the marketplace that connects narrators with authors and publishers, and it has strict audio requirements you must meet for files to pass review.

Here’s the practical workflow from profile to finished book.

Set up your profile and audition

Create a narrator profile and upload samples that show your narration range — clean, warm, well-paced reads. Authors browse profiles and post titles with audition scripts; you record the audition passage and submit it. Deals are typically structured as either a flat per-finished-hour arrangement or a royalty-share split. Audition consistently and tailor your sample to the book’s tone (a thriller and a cosy memoir need different energy).

Know the ACX audio requirements

ACX rejects files that don’t meet its technical spec, so build your chain around it from the start. The core requirements include:

• Consistent loudness within a defined range, measured in RMS, plus a peak ceiling and a noise-floor maximum.
• Room tone at the head and tail of each file.
• Each chapter as its own file, opening with title/chapter announcements as specified.
• Mono or stereo MP3 files at the required bitrate and sample rate.

Because the exact figures can change, always check ACX’s current submission requirements rather than relying on memory. Understanding loudness helps — see our explainers on LUFS and loudness and sample rate and bit depth.

Build a quiet, dry recording space

The biggest reason files fail is noise and echo. ACX wants a low noise floor and a dry, consistent sound across hours of audio. A treated space is essential — follow our guide on how to build a home voiceover booth. Choose a mic that suits your voice and room; our breakdown of condenser vs dynamic microphones helps you decide.

Record and perform for the long haul

Audiobooks are marathons — many hours of consistent reading. Keep your distance, energy and tone steady across sessions, and re-check your setup if you record over several days. Warm up first using our vocal warm-up routine, hydrate, and punch in to fix mistakes as you go rather than re-recording whole chapters.

Edit, master and deliver

After recording, edit out mistakes, mouth noise and long pauses, then process the audio to hit ACX’s loudness and peak targets while keeping the noise floor low. Add room tone, top and tail each chapter correctly, and export to the required format. Mastering for spoken word follows the same logic as our guide to mastering a podcast. Submit, respond to any QA feedback, and you’re done.

Frequently asked questions

Do I need experience to narrate audiobooks on ACX?

No prior credits are required to audition, but you do need clean audio that meets ACX’s specs and a steady, listenable read. Many narrators use audiobooks to build their first credits while developing their craft.

Why do ACX audiobook files get rejected?

Most rejections come from technical issues: loudness outside the allowed range, a noise floor that’s too high, peaks that are too hot, or missing room tone. Building your recording and mastering chain around ACX’s requirements from the start prevents most failures.

Can I narrate ACX audiobooks from a home studio?

Yes — most narrators do. You need a quiet, acoustically dry space, a suitable microphone, and the ability to master files to ACX’s loudness and noise-floor standards. A converted closet or DIY booth is often enough.