The K702 shares a lot of similarities to it's younger brother the K701. Housing is essentially the same but they now have a removable cable and also a flat headband similar to the one on the K712 and the 65th Annie
My review is going to be about the original 702 with the bumps on the headband.
Build and comfort
The build of the AKG K701/702 is identical. Solid plastic with no metal parts. While I'd like to see some metal, plastic is lighter and less prone to scuffs and every metal headphone I've owned seems to always be prone to weak spots. The headband is leather, it's a very stiff leather with the bumps on the inside. The headband has the auto adjust sliders so no faffing around with clicks like many other headphones.
Cable is mini XLR and detachable, AKG always make high quality cables so they will last a long time. The pads are quite hard, they are velour and very deep. The build is excellent as expected, AKG have mastered their design and I wouldn't worry about weak spots unless you are very unlucky.
Bass
Bass on the K701 7 bumps was quite rolled off. They weren't AD700 rolled off but they were not what I'd consider a complete headphone. The 702 sounds the same as the 8 Bump K701. Bass on the K702 is also pretty lifeless and rolls off but sounds more full then the older K701. You will hear most of the low notes fine, at the lowest pockets not so much. The weaker bass however, also helps this headphone to be an absolute detail monster for gaming and for those that like a headphone that is more analytical.
Mids & Treble
The mids on the older K701 and the newer 8 bump K701 were both forward sounding. On the older K701 they had this weird plastic timbre to them. On the newer 701/702 it doesn't seem to be much of an issue any more. The mids are detailed, separation very good too, vocals have a detailed, smooth tone to them The upper mids can get a little shouty though at times giving the headphones a bit of an unnatural feeling in the higher mids. Instruments sound quite natural with a nice sense of air and intricacy.
I think the mids are beautiful for the most part, gamers will be pretty immersed when it comes to it's ability to pick up small details in the virtual space. Another issue I have is the K702 has very little body in the mids but this can also work as a pro if people want that detailed, airy sound.
The Treble on the K702 is actually quite smooth sounding but the upper mid peak can give the impression that the AKGs are quite bright up top. Now they can be a tad bright, the treble is extended and pretty airy..well, very airy. This is a very open headphone all throughout but the treble just gives it so much air on top. Along with the mids, this headphone will pick just about any sound you hear in the track or game.
Soundstage & Accuracy
The original K701 was famous for a super wide and airy soundstage. I found the soundstage of the original to not be very fined, it sounded endless which can make some recordings sound too spaced out. In games though, this could actually be a pro because in open world games sounded truly open, with this gush of air that was unlike any other headphone. The K702 follows with an equally large stage but has a bit more definition. It's super airy, super wide and more natural.
It's a no brainer that a relatively balanced sound combined with a large soundstage will have excellent imaging for games and music. It does! surprised? no course not, the 702 is excellent in this area so those competitive gamers will have a blast killing everything they hear. Professionals will also appreciate it's imaging capabilities.
Competitive and Fun gaming
You've probably guessed by now that these are a beast for competitive gaming. The open stage and godlike accuracy make this a deadly tool to have to get that edge. I would compare it too the other gods, AD700, MA900 and friends. The slightly added bass doesn't mask up any detail since these are still below neutral. Footsteps are so easy to pin point that it will feel like you are cheating.
For fun, these are fun in some areas and lacking in others. I think a good headphone for immersion is something that can render mids well and sound open with a nice full bass. These do everything nearly correct, the air sounds amazing, open spaces sound like they go on for miles! games like Read Dead Redemption for example, it's not amazingly recorded but with the mixamp you pay attention to every detail! Crickets at nice sound relaxing, hearing birds in the distance and other little world noises that you pick up. One thing it's missing is the that low end, explosions won't have that impact of say the Annies or K712 both in other areas they are fantastic.
Compared to some other headphones
K612 Pro
While they are related there's a lot of differences. The K612 is a more balanced headphone, it's more natural sounding and steals that fantastic imaging from the K702 although slightly inferior. The K612 however, doesn't have nearly the soundstage that the 702 has. The 612 has a layered, medium sound stage for an open phone so it isn't a slouch at all. The K612 is warmer, bassier and probably and all round better and complete headphone. The K702 though is more competitive oriented and images a little better than the K612. it's much more airy and detailed. If I had to pick one for music, it would be the K612 but for gaming the open space of the 702 wins me over every time.