[KingFish]

If you are using Nero express - the little check box "normalize audio" is ON BY DEFAULT, you have to manually uncheck this box, every time you burn an audio CD, it nomralizes RMS 0db -

frightening, nasty, this is most likely what is occuring, if you had a good, nice healthy top end, and your mix rolled off, before normalizing this drastically, you bechya you'd have top end out the kahoona.