The pleather pads to me makes the HE500 very dark sounding and closed in.
I have a third party cable on my HE500 and surprisingly for me, I have been listening all week, driven by the Triad L3/LLP. It is a great combination, much better than when the headphones was driven out of the Violectric V200. Both amps are sourced by the V800. Have been picking up the HE500 with the L3 every time I have wanted to listen to music this week, instead of my LCD-2 out the the V200. Which was my go to headphone when I was listening to both headphones out of the V200.