So I have been spending more time with the FW10K and I A/B’ed different cable, the stock cable is really the best synergy and except if you want to run them balanced there is no reason to upgrade the cable (unless you can afford the PW 1960 which apparently pairs very well). The stock cable is a smooth, refined copper cable that is up there with the best upgrade cable IMHO. It has a small footprint and is very comfortable to wear. Kudos JVC, aside from Audeze and the stock cable of the LCD i4 I have never has such a high quality cable with an IEM. Now burn in, things are settling in nicely at 250 hours I don’t believe those will further change which means I’ll start on my review The more I listen to the FW10K, the more I am convinced it’s the most refined dynamic driver I have ever had the pleasure to listen to. There is boatloads of nuances, note I am not saying details because it goes beyond that : textures, timbre, attack and decay make it such a treat to listen to. Jazz has never sounded better really, but with burn in and the smoothness I find myself listening to a whole lot other genres (except more forward / agressive stuff).