As mentioned above, the Y cable just delivers an analogue signal to the head unit. In my opinion, the sound out of many ipods, particularly the original 20/30/40/80/160GB hard-drive type is very sub standard, particularly if fed into a low impedance output. Attenuates signal strength at loud notes and has shocking low frequency output. Mind you my newer 16GB Nano is much better, but not a patch on something like an iRiver.
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