I am by no means an audiophile, but I do notice a little bit of a difference, depending on the quality of the song and compression and it’s thru the direct connect on my Pioneer IP Bus. It doesn’t matter to me, but I was just creating the expectation that it may happen if you’re picky with the music quality.
Also I was under the assumption he was using the headphone jack on the ipod and maybe the FM tuner, which has a bigtime sound quality drop.