Ok if you compare a WAV to a 192kb MP3 at your Desktop PC using good quality headphones, then you may notice a small difference. The treble may be a bit lower or something if you really concentrate. Man ive got good ears and expensive seinheiser headphones and I found it very hard to differentiate a wav with a 192kb vb file encoded with LAME or Fraunhofer, even more so with ACC (MPEG4 Audio).

But when you are driving, it all sounds the same since there are road/engine noises in the mix.


Remember that mp3/acc basically removes the sounds the human ear cant hear, so its not completely compressed as much as you think it would be.