can you actually hear the difference?

WMP claimed that WMA at 64kbps was the same sound as MP3 at 128 KBPS....NOT

besides the Rio I have a cd player in my car and did an A/B test between WMA file at 64kbps and the actual CD and the results were quite noticable...and disappointing....i am now redoing all of the CD's that were done at 64 at 128..thats about 200 of them.

If 128 for MP3 or WMA is said to be CD quality, what would the point be to convert them at a higher bit rate?? is there a rate at which the compressed media would sound better than the source?

Thanks!