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Originally Posted by fjtorres
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I'm honestly not sure, since I had no idea that AAC was so multiformat.
However, a quite google gives me this from online-convert.com:
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Technical details of AAX files
AAX files can contain – next to the usual audio data, bookmark and chapter information – images and other features like links as well. This makes it a very popular extension primarily for children's books. AAX files support a bitrate from 32 to 128 kbit/s. The audio data is AAC encoded which provides a very high audio quality. AAX files are heavily protected and can only be played with a paid Audible.com account.
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