Your ears can't tell the difference, or you don't have the cans to tell the difference? Cheapest solution: research the matter, and find a pair of headphones that suits your listening style. Maybe burn them in for 5 days (and in that interim, compare them against your usual pair of earbuds/cans so you can pick up the usual headphone freak differences, then do a blind side-by-side comparison.

If that's too tough for you, feel free to send me an iPod touch, and I'll be happy to run them out.

As it is, I'll say that the n800 don't produce noise like my cheap PC headphone jack.