Hey! I currently got a sennheiser g4me one headset but I want to try some headphones to see if they're better. Which one is the best for 80% FPS gaming (csgo) and 20% music/movies. I have looked at AKG 701/7xx/702 (don't know the difference except price), AD700x, Beyerdynamic DT 990 250 ohm. If you got any other suggestions feel free to tell me. They have to be in the same price range as the ones I listed though.
Also I got a Xonar DG soundcard if it's going to help.
The AD700x has good imaging and soundstage, but it's all about a sparkly treble and thin mids and bass. Pads are velour and the headphone is super lightweight, but the way it grips your head (stock) is weird and the pads are so broad they rest around and on your ears. Cable is not detachable, but very nice 3 meter silver cable and a screw-on 1/8" to 1/4" adapter.
The AKG K701 is a step up in resolution, imaging, and more refined treble... a little more "involving" in the mids and bass with better bass extension than the AD700, but still the lightest mids and bass of the 3 AKGs you mentioned. In their heyday and introduction, these were like the Sennheiser HD800 of their time, intended for mastering and professional use with a reference sound signature. Angled pads rest completely around your ears, velour is pretty soft and good but/and the cushioning doesn't flatten much. Headband bumps. Non-detachable cable and 1/8" to 1/4" adapter.
The K7XX is like a K701 Anniversary like MLE reviewed, with more bass, flat (non-angled) pads with a tad more squish (the tips of your ears may touch the felt covering the driver), more well-rounded than the K701 and a slightly warmer than flat/reference sound (but pretty close). Comes with one detachable cable and a 1/8" to 1/4" adapter (screw on type).
The Annies (K701 65th Anniversary) is the same design as the K7xx and same general sound, but AKG is a little more picky about driver matching and picking out the "A+" grade drivers, but unless you love the color and collectability, probably not worth the extra $$$. I don't know about accessories (probably at least a 1/8" to 1/4" adapter!).
The K712 I had (and sent to MLE for his review) is like the K701 65th Annies, but the depth of the memory foam pads was a little increased (and measured by AKG as +3dB boosted bass, though my burned-in Q701's that were used for thousands of hours and probably had some Earpad deflation/degradation/skin oils would produce more bass). I do believe AKG was a bit more picky about driver selection here too (at least with the early Austrian-made models, that was the only kind I heard), because my Q701 didn't sound quite as refined (and still had more bass) compared to my K712 when I used the same pair of pads on both headphones. The K712 came with a 3-meter orange cable and a coiled cable, 1/4" adapter.
The K702 is kinda in-between the K701 and K712, sound-signature wise, and has seen a few variations over time. Cool dark-navy color scheme. It has angled pads like the K701 (and Q701), and detachable cable with a 1/4" adapter.
Beyerdynamic DT990... I am honestly afraid to try these. I know some people love these, but I owned the DT880 for a month, tried to love it but the highs fatigued me, leading to excess earwax production and physical pain, and my first experience with tinnitus. Some people say the treble is so clean that they don't experience the problems I had (even with a tube amp), I tried them because there were several very positive reviews, but given my experience I feel like I have a responsibility to at least warn people to listen with caution. The DT990 is supposed to have even MORE TREBLE (and bass). Beyer makes quite soft Earpads and puts a lot of padding on the headband, but I still got headband hotspots after extended wearing. Also, perminent cables and a 1/4" adapter.
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Of the above, I probably would recommend a Kxx or K702, whichever seems better to you.
You could always try the other kind of pad too if you want two kinds of fit and small sound differences. Another cool option is the K612, but that's a deceptively power (current) hungry headphone, so you'd probably be best off spending the price difference on a better desktop amp. I'd like to try the FiiO K5 some day, the current-mode Liquid Carbon did wonders for my K612 (almost obscene, eh?) and made it almost planar-like in it's speed and performance. The K5 is also current-mode, but I haven't heard it and only speculate