Bottom line is that when you go from WAV (uncompressed) files to MP3 (compressed) files, you lose fidelity in the translation. If what I read is right, you want to burn audio CDs (CDA files) rather than MP3s, which is essentially a data CD (just data that happens to be music files). The 128 bitrate for your basic MP3 track will sound fine with those little bud things shoved into your ears, but in a room stereo scenario, with room acoustics in the equation, the fidelity loss will likely be evident. If you must do MP3, do them at 320 bitrate.