All this talk about sound quality makes me think about a great thing that happened to me.3 months ago my left eardrum "vanished" after an ear infection. I don't know the medical term for it, but it didn't hurt, contrary to what some people may say.
A few days ago, it finally healed completely and I can now hear noticeably better with my left ear. I wish the same thing happens to my right eardrum. I mean, why spend money on expensive cables, DAPs and whatnot when a burst eardrum can do the trick? Some people buy them and convince themselves their rig sounds better with them. The cables may improve the sound, but I think a lot of people don't notice it. Well, unless they get a new eardrum that is. I firmly believe this is a good way to be more content with what you have instead of buying new equipment.
This can go the other way around though. For instance, people who are saying they cannot hear the difference between the AK120 and AK240 (I read about this here a few days ago, can't remember where) may be more prone to murdering their wallets after this. Well, whatever the case, there's no denial that a new eardrum, just like a new pair of shoes, etc can make you enjoy your rig a lot more.
Take care guys and remember that this is just my 2 cents.