If the treble on these bothers you, even with various mods, If you have a spare pair of pads and don't mind breaking them, try doing the jergmod but making it so that it is as much foam exposed as possible, mine have split now to the point that everything except the top part that touches your head is the exposed yellow foam, the treble is smooth as butter (with a bit of EQ). Just saying if you STILL find the treble / hollow sound / glare in midrange a problem even with jergmods, this does actually completely remove ALL sibilance and tizz from the treble, hollow sound and midrange glare, its funny how I broke the pads, but now I do not have any urge to upgrade the headphones, the proper jergpads with the velour mods are probably similar I have not tried them, but if you are bored and have a pair of spare pleathers / do not mind breaking, I would be interested to hear what people think of it. Doesn't look pretty, but who cares as you cannot see them when they are on your head anyway, I was going to buy some new pads but I will just stick with my broken pads because with the EQ and "jergmod extreme broken pads mod" they sort of remind me of HD650, but better. Some people asked me for an EQ file, this is what I use most of the time, your preferences might be different (I like bass and warm sound, hate bright treble and sibilance) but this will give you an idea of the shape to bring the upper mids up and sort out the treble, I also use "warm" filters on the treble area because it seems to smooth it out a bit. I don't really feel any need to upgrade them anymore as I like them with all genres. They sound smooth and natural now, but still have bass, speed and a bit of sparkle in the treble.
Edited by nicholars - 4/3/14 at 11:26am