Just an update to my earlier post.
I'm into my few weeks with my new x5. My initial thoughts when I posted here was the treble and highs were too tiring and fatiguing with this player attached to my cars HU. But wicked and awesome attached to my tube amp at home. And that the iPod was better with my car's HU than the x5, the HU being designed and optimized for iPod.
Boy was I wrong, I recently bumped into monoprice's website and ordered a few cables and wires from them. Apparently, there are different 3.5mm Jacks and, in particular, when the x5 is on a casing, you need to use a slimmer. Well, apparently, I had to use one as well for my Cars HU as my original 3.5mm couldn't attach fully resulting to the initial output. Alas, just got my mobile 3.5 Jacks from monoprice and now I see the big difference, not to mention hear it.
Anyway, just wanted to share.