First of all, thank you SO much for the thread. The amount of work you've put into this is incredible. I know my question is probably not unique but I attempted to search and keep coming up with 3+ year old threads.
I currently run a JVC RX900 with Zalman clip on. I'd like to move to something a little better for me. Currently the tips of my ears will begin to hurt after extended sessions as they press against the driver cover (I think that's the right name). I'm first looking for something that will be a little deeper in the earcup. Right now I'm leaning towards Q701 or DT990, however I don't know if either of them have deeper ears than the RX900?
I would like a headphone that will allow me to feel the "engine rumble" in movies like Star Trek or when playing something like Mass Effect. The positional accuracy it provides takes a close second. I'm roughly looking at a $500ish budget stretched over the next odd months. I don't mind going over if it's going to REALLY pay off however I don't really need music type phones since it's about 20% of my usage at the computer.
Thank you in advance.
Having given a close friend a pair of JVC HA-RX900 (top pop modded), I can tell you that the Q701 are the first headphones I've used that are big and deep enough to rest on my head and leave my ears free. I find them VERY comfortable, especially after I wrapped the headband with a baby seatbelt-cover to cushion my thinning hair from the bumps, which only started to bother me between 1 and 2 hours if I let it rest in the same place.
I love the soundstage and emotional signature, and I really enjoy them for gaming. They have IMO an impressive rumble when called to do so, for example the anomalies in Metro 2033 sounded fantastic and really seemed to hit a subsonic WOAH! I should go back and play Mass Effect again now that I have these, but I'm having too much fun playing Halo 4 online at the moment.
I can't compare the Q701 to the DT990 from experience, but I've heard great things about booth headphones, and that the DT990 has an addictive bass level that doesn't defeat the rest of the sound spectrum.
2x consider a return policy, but I would add that both will probably please you with their high quality. Good luck!