ACX Audiobook Recording Requirements

Prepare one chapter or section per file, consistent mono or stereo audio, and human narration unless ACX authorizes otherwise. Current ACX guidance specifies 192 kbps or higher CBR 44.1 kHz MP3, RMS between -23 dB and -18 dB, peaks below -3 dB, noise floor below -60 dB RMS, and one to five seconds of room tone. Verify the current ACX help page before delivery.

Create an outline or script, confirm rights and consent, choose the quietest practical setup, and record a short representative test before committing to the full session.

Keep the microphone position consistent, work in manageable sections, and after a mistake pause before repeating the complete sentence.

Use the transcript to remove retakes and unwanted sections, preserve intentional pauses, and improve clarity conservatively while comparing against the source.

Listen from beginning to end, confirm rights and sensitive material, then prepare the required file, metadata, transcript, artwork, or platform submission details. Recheck current third-party requirements before uploading.