Master Your Audiobook for Findaway Voices Submission

What Are Findaway Voices' Audio Requirements?

Findaway Voices requires each audiobook chapter file to have an RMS loudness between -23 and -18 dBFS, a true peak below -3 dBFS, and a noise floor below -60 dBFS. See the audio mastering glossary for definitions of these technical terms. Files must be MP3 at 192 kbps constant bit rate (CBR) or higher, or FLAC, at a 44.1 kHz sample rate. Findaway Voices prefers FLAC for the highest quality submission. Findaway Voices accepts both mono and stereo files, unlike ACX which requires mono only. Each file must start with 0.5 to 1 second of silence and end with 1 to 5 seconds of silence. Findaway Voices also enforces a maximum duration of 120 minutes per file. These specifications match the ACX audio requirements almost exactly[2], with the exception of stereo support and the duration limit.

How Does ChapterPass Handle Findaway Voices Requirements?

ChapterPass produces ACX-compliant MP3 files that inherently meet all Findaway Voices audio specifications. ChapterPass adjusts RMS loudness to the -23 to -18 dBFS range, limits true peak to below -3 dBFS, manages the noise floor to below -60 dBFS, converts to mono MP3 at 44.1 kHz with 192 kbps CBR encoding, and adds silence padding within the required ranges. Because Findaway Voices and ACX share the same core specifications, files mastered by ChapterPass for ACX submission are ready for Findaway Voices without any additional processing. The only difference is stereo flexibility: ChapterPass converts audio to mono for ACX compliance, but narrators who specifically need stereo output for Findaway Voices can use a different workflow for that platform.

What Is Different Between Findaway Voices and ACX?

Findaway Voices differs from ACX in several meaningful ways despite sharing the same core audio specifications. Findaway Voices accepts both mono and stereo files, using Joint Stereo encoding for stereo submissions. ACX requires mono only. Findaway Voices enforces a maximum chapter duration of 120 minutes per file, while ACX does not publish a specific duration limit.

In August 2025, Findaway Voices rebranded as Voices by INaudio[3]. The technical requirements remained unchanged after the rebrand, but the submission portal and brand presence now operate under the INaudio name. Authors and narrators who previously distributed through Findaway Voices continue using the same platform with the same specifications.

The largest difference between Findaway Voices and ACX is distribution reach. Where ACX distributes exclusively to Audible, Amazon, and Apple Books, Findaway Voices distributes to dozens of retail, library, and subscription channels across 170+ countries, including Scribd, Kobo, Google Play, Libro.fm, and public library systems through OverDrive and hoopla. For narrators and authors who want wide audiobook distribution beyond the Amazon ecosystem, Findaway Voices provides access to markets that ACX cannot reach.

Can You Submit the Same Files to Both ACX and Findaway Voices?

Yes. ACX-mastered files meet or exceed all Findaway Voices audio requirements. ChapterPass produces mono MP3 files at 192 kbps CBR with loudness, peak, noise floor, and silence padding that satisfy both platforms. The only consideration is channel configuration: ACX requires mono, while Findaway Voices accepts both mono and stereo. Mono files work on both platforms, so narrators who master with ChapterPass for ACX can submit the same files to Findaway Voices without reprocessing. Narrators who specifically need stereo output for Findaway Voices would need to handle that conversion separately, but mono submission is the standard for spoken-word audiobooks on both platforms.

Sources

1. Voices by INaudio Technical Requirements
2. ACX Audio Submission Requirements
3. Voices by INaudio Launch Announcement