"Domain audiobooks" refers to audio recordings of books that are in the public domain. These are books whose copyrights have expired, allowing them to be freely distributed and used by anyone. Full definition
In general, public domain audiobooks don't sell in the same volume as do contemporary books. (karencommins.com)
Today we received an email from Hugh McGuire, the guy who started the fantastic LibriVox public domain audiobook community (with many of their source eBooks coming from Project Gutenberg), announcing the launch of his new audiobook company called Iambik Audio. (gutenbergnews.org)
An outline of the steps I followed to publish my public domain audiobook through ACX is shown below. (karencommins.com)