The Socialist Nerd
100+ Head-Fier
iSine has a 2-Pin connector, there can be no pop sound unless it happens in the driver
You should also be able to feel the pressure in your ear change, like feel that your eardrum is getting pushed or pulled in some way. This is a good way to tell driver flex apart from other noises. I noticed it happens on many larger planar magnetic headphones, and I also believed that it was the cables, until I played with them enough to notice that when the pop happens, they push a bit on my eardrum, that's how I now know it is driver flex.
BTW, most planars do, not a specific company, seems to happen to most of them, but to a larger headphone, you need to really be twitchy and otherwise aggressive with it to make it happen...
I don't feel the pressure changing. I switched to the 3.5mm cable and tested with the apropos adapters on my iPhone XR and Note 9 and the problem has been decreased. Audeze is going to send me a new Lightning connector next week so hopefully that will resolve my problem with the LX's.