The first pair was samson sr850, I listened to them for about 3 weeks and then wanted to see how they'd change going from single sided to dual entry along with a mogami mini quad. I got them done professionally and the sound was slightly different, nothing that really mattered. But I couldn't listen to them more then 30 minutes without my ears hurting. Before I would listen 3-4 hours without an issue. I recently recable a pair of sennheiser 407 from dual entry to dual entry with a telephone cord and once again I went from being able to listen for hours to maybe 20-45 minutes before they started to fatigue my ears. Given the telephone cable isn't the highest quality but I wouldn't expect this with the mogami cable professionally done. The source, amp and length all stayed consistent. Not sure about material or awg.
Both stock headphones before recabling were perfect without fatigue, after the recable is when they started to fatigue. And its not convincing that I heard something I didn't like, my ears began to hurt.. not really subjective at that point.
And any given day I'm going to be on a headset/headphone for 8-10 hours between work, voip and games. I use stock cheapo headsets to senn 555, to denon 2000's so its a fairly healthy range and none of these give me issue. It's only when stuff recabled has it been an issue.