I recently got a chance to play with pair of k702 friend traded me. Still felt the same that I did when I remembered the k701. Didn't sound bad but had had a bite to them which bothered my ears with certain tracks and the vocals sounded bit odd. Since they're completey open air there is no point to mess with the back of the driver for modding. What I did was messed with front to get them sounding to my liking.

The pads have a protective screen and well distanted from my ears so what I did was cut some r-19 fiberglass which is not very desne into an octagon like shape. Then I placed it over the already disc foam and put the pads back on. Yea I know people logically will say "well that will muffle the sound. Fiberglass or any acoustic damping should only be implied to back of driver"

Well not exactly. Depends on density and other things as well. If yused a bit of imagination you can "see" the frequencies only slowing down and help absorb backwave resonance of the ear. Well what did my idea do out of pure curiosity?

put the pads back on and...yay! Became bit more evened out where I got the midrange and higher frequencies to my liking. Without limiting bass output as well. I notice these have pretty good bass and sub-bass extension. Also now I can listen to songs without the bite as well. They still extend upwards fairly well but more tame and enjoyable defiantly. I actually like them now. Thing I do like about the k702 as well is their insensetivity. Sound dead quiet running off of speaker outputs. Just the pads hurt back of my ears after wearing them for very long which is odd cause they are extremely light and the pads are super comfty. Probably how the back end of the pads couple my ears maybe

I swapped out the foam disc in front of the drivers for a different material. I think it was a type of felt. I can't remember. I got the idea from a mod on HF, in which a quarter of the ring is cut out separately, covered with a layer of electrical tape on one side, and put back in place with the rest of the ring. I've also been experimenting with using a larger foam disc that goes over the felt ring (covers hole in middle as well).

I also more or less sealed the small middle part on the back of the headphone (the part that protrudes). I believe this took the bump around 2.2KHz and lowered it to around 2KHz or so and made it less pronounced. Overall, it gave the K702 AE more of a V-shaped signature than before without messing up the original sound or balance much. It's easier to listen to for me than stock. I haven't listened to them in a while, though, so it would be good for me to go back and see how they sound now. Plus, I don't have other headphones on hand to compare with at the moment.

Keep in mind this is with the K702 65th AE, so the pads are different than some of the other K70x revisions.

Seems like it's a pretty decent headphone with some minor issues that AKG could have fixed with a bit more time and research. The 65th AE pads seem to be a good step in that direction, I guess...

K702 Alien Mod 1.0 

REX 702, brought to you by Ancient Alien Corporations.

Now I wonder how the k712 will sound. Its supposedly bassier due to the memory foam. Looks beautiful