I have noticed that when using a mixer that has the headphone port on the top of the mixer like the DJM800 it causes your headphone lead to bend a fair bit and over time can cause the wires to fail and you may have to wiggle the lead around to stop poor audio quality. As you can see in the image below, my headphone cord has a bend in it and is causing me some issues. When I unplug them the lead still has that bend in it and isn't good for the internal wires. I have noticed on Beats By Dre they have an "L" shaped plug to help stop this, so I'm going to buy a "L" shape connector for my lead to help stop my cord flogging out. Going to use something similar to this, obviously this is the wrong size but its just to give you an idea of what I'm talking about. Good to know if anyone else has had any problems with their cords, and also you're ideas on what I'm looking at doing.