I recently plugged in the stock cable into some zs6's after listening to exclisively with the upgraded braided rope looking one, and I was also shocked at the difference, I remembered when I first tried the new cable and did notice a slight difference (I Wasn't blown away I just noticed the highs slightly curbed and the overall range to be clearer, whether that's something to do with the cable itself or the malfuntion of the stock one that I owned, that's not tested)_ so kept it on but going back the other way has been the most noticable, I just received a few of the newer darker bronze looking cables (bsacially the same) the quality of audio is still good if not better than the older upgraded model, also the wire covering feels softer, still quality just less twangy like my other ones are lol. like wirey,, still good. I do like the newer bronze ones now, they''re like 0.02 thicker and softer more pliable sheath. happy days. the mids and upper mids sound punchier. i'm really sceptical too but initial listening of material I'm very familiar with on a source I am welded too, that's my initial finding. the airyness is less but the punch and dynamic sound is warmer. but still clear. I don't drink really at all, and when i drink (I've had a couple of brewskadeezys) I might be hearing things. 10.10 weould recomend. maybe checkout the impedance dongles too, not sure where you get them but I've heard they're good for tuning on different sources so tame harshness. happy times. tldr: going back to the stock cable after so long with the "upgraded" cable will offer the biggest or most noticeble difference as opposed to the initial shift to "upgraded" cable. In my opinion, or at least from what I found. and I stand by that.