Audio quality levels & file formats
All podcast episodes published on our platform are made available in:
- 3 quality levels (
- 2 formats (
Different quality levels are employed to enable a better experience for users on slow (or expensive) internet connections while still allowing other users to receive high quality audio.
Each quality levels uses a different bitrate and sample-rate, and so determines it's size.
|Quality||Bitrate||Sample rate||Data use||Connection type|
|Low||28k||32kHz||± 11 MB / hour||2G+|
|Medium||56k||32kHz||± 20 MB / hour||3G+|
|High||96k||44.1kHz||± 35 MB / hour||ADSL/Fibre|
Our quality profiles are tuned for speech-centric content like podcasts, audiobooks and news broadcasts. Ambient music, intros, outros and other jingles will still sound acceptable on the lower profiles, but only the
high quality profile provides a good music listenening experience.
lowquality profile enables extremely small file sizes, while still the minimum fidelity for consuming speech-centric content.
mediumprofile doubles the bitrate and produces a result that will satifisfy the majority of users.
highprofile doubles the bitrate again and mostly benefits users who listen on fast internet connections, in quiet environment using good sound equipment.
Different file formats are employed to ensure wide compatibility accross browsers, software and devices.
By default our web player and RSS feeds use the AAC encoded
m4a version of the files, as this produces the best quality per bitrate, especially for our
low quality setting.
Users can change RSS feeds to access MP3 instead, and our web player will automatically fallback to MP3 if the browser does not support AAC.