Not content with dominating the online sale of printed books and ebooks, Amazon is also moving to extend its dominance in audio books. The e-commerce giant already owns Audible. ACX is aimed at small publishers and authors wanting to create an audiobook version of existing print editions. Given the increasing popularity of podcasting and streaming music services, it makes sense to offer independent authors a way to grab a slice of that audio content pie. Authors can create their own audio, but they would need decent equipment and some technical savvy to meet ACX's audio quality requirements. ACX steers authors towards their roster of professional narrators and producers, and offers long term distribution through Audible.