Okay one last question only talking sound quality here everyone already knows the Empeg Interface Rocks

What would sound the best. Assuming the amps line levels and speakers are all the same and there all installed in the same car

Empeg Playing 320Bps Mp3's or Waves
P4 XXX with win amp and a Good SB car (zx or zx platinum)
Alpine Deck playing Mp3's or waves from cd or DVD audio ?

Which would sound the best and please explain your answers