"The Cosmo Pad"
I tried the Jerg pad mod on my He-400 and it did help smooth out the signature of the headphone a little but i still felt like the headphone sounded more like a speaker next to my ears than a headphone. So i decided to try to angle the pads.
Also, I don't believe there is enough space between your ears and the driver. There never seamed to be enough air for the dynamics to breath and therefore i feel the headphone shouts at your ears and it became extremely fatiguing. Fortunately, angling the pads pulled the driver away from your ears as you'll see in the video.
This mod was done on an he-400 so i don't know how the mod will sound with the he-500's signature.
The He-400 now sounds like a more all around headphone. The imaging because absolutely amazing
I believe because the cotton balls dampen the resonance.
I knew it sounded better immediately but once i had a chance to close my eyes and focus on the music, the imaging became 3-d
I cut these pads up a few nights before and regret not having another pair to start over with for the video
Try the cotton balls without cutting up the pads. If it's too tight and the cotton balls just get squished instead of expanding the pad then you will need to cut them.
Also, i believe this will work with the pleather pads too.