I much concur Frank's reply but in particular with the above, which some people tend to ignore knowing or unknowingly. This is something I can confirm especially after the head-fi meet today. I would also add headphones cables to this list as very important.
Now there's a downside with tuning your system to suit some heapdhones, as you may find it improperly tuned for some others. Unless you own multiple sets of gear and ... and here we go. :) Tube rolling could be a good work-around though. Some will love tuning their system and some won't. Everyone to their own. I am in the first camp.
No disadvatanges with getting a nice headphone cable with great synergy for your headphones though. Other than cost. :)
Edited by negura - 4/27/13 at 6:19pm