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Comparison of Audio Encoders

The aim here is to choose a compression format with which to encode an entire CD collection for easy access in a media center.
I've taken a typical 4 minute song and encoded it using LAME mp3 and iTunes AAC at various bit-rates and then analysed their spectral content and compared them with the raw original.
Combined with a subjective listening test and accounting for the size of a typical collection and storage capacity, I recommend 256k AAC.


The song used was 'Countings Crows - Hard Candy'