dazzerfong
1000+ Head-Fier
I too found the bass lacking at first coming from the tf10 pro but found that using a fiio headphone amp warmed up the sound considerably. I also noticed an increase in bass when using Apple sources and think they probably tuned them specifically for Apple devices when designing them.
I poached a mate's iPod Touch (forgot which generation, that thing was 3+ years old), and it sounded more or less the same. Less hissing, but besides that, not much difference IMO. That lack of bass isn't bothering me, as I know I had the same reaction when I moved from my MH1C's to the MA750, and again from the MDR-1A to HD700. Both times, I felt weird about the lack of bass, but after a while, it feels strange the other way around.