: For many people, 128kbps AAC is "transparent," meaning they cannot distinguish it from the original uncompressed source in a blind test. File Size Comparison
A file (typically using the AAC codec) is generally considered to be of good audio quality , especially for casual listening and mobile use. At a file size of 3.54 MB , this represents a standard 3- to 4-minute song with highly efficient compression. Quality and Efficiency 128kbps m4a(3.54 MB)
: M4A is more efficient than the older MP3 format. A 128kbps M4A file often sounds as good as a 192kbps or even a 256kbps MP3. Content Type : : For many people, 128kbps AAC is "transparent,"