All speech-based podcasts are offered as 64kbps mono mp3 files. Enhanced podcasts, such as Best of Chris Moyles Enhanced, are available as AAC files (.M4A). All podcast series music are offered as 128kbps stereo MP3 files.
The sound quality of our mp3 files conform to the BBC standards. We feel that this is more than sufficient, and, given that higher quality audio on the web would be expensive, we have to find a balance between audio quality and cost. Podcasts and mp3 downloads are very popular and we believe we've got the balance right.
The BBC continually monitors and reviews the sound standards to ensure the best possible service and value for the licence fee payer.