Bookbaby can only accept a single M4B file at this time, and that file must be placed into a ZIP file before uploading. The M4B file must include the entirety of your manuscript and your book cover should be embedded in the file. It should begin with your title, author name, and narrator name being read. Additional requirements:
- All mono or stereo.
- No extraneous sounds in the recording.
- Measure between -23dB and -18dB RMS and have -3dB peak values and a maximum 60dB noise floor.
- 192kbps or higher, Constant Bit Rate (CBR) at 44.1kHz.
For more information about creating M4B or ZIP files, click here. YOUR M4B FILE MUST BE UPLOADED WITHIN A ZIP FILE.