I haven't noticed any difference with the Vmoda BoomPro vs stock cable on my Philips Fidelio X2. One thing to note, though, is that I have noticed that the BoomPro causes issues when using my FiiO E9. In my very limited knowledge, I believe that this is just because the output on the E9 is not designed to accommodate the 3rd band on the BoomPro's jack (there are usually 2 bands for the left and right channel, but the BoomPro has a 3rd band for the microphone signal), so the audio cuts out if the jack is moved at all. This is only a problem when using the E9, though. No such problems exist when I am using the BoomPro with my PS4.