What is the Optimal File Format/BitRate?
For the best balance between file size and sound quality for both home stereo and portable MP3 player use, MP3 files at 128kbps or 192kbps is the best choice. By selecting a lower bitrate, you are able to maintain CD sound quality, while at the same time, maximize the storage space needed to hold the collection. For this reason, 128kbps and 192kbps are very popular bit -rates for MP3 files.