I think you should learn about using a mac before you quote files on their system. WAV is a windows uncompressed format. The mac equivalent is AIFF. WAV & AIFF are equivalent to CD quality as they are an exact extraction with no loss of quality. Whereas the lossy formats which throw away information are those such as mp3's, Ogg Vorbis, wma, m4a. m4a is a newer format than mp3.