The answer is 'for myriad reasons'.

Thanks for the measurements!  Has anyone published comparison measurements between these and any of the other AKG K/Q line up?  I own the K712 and have a pair of K7XX on the way.  Used to own a pair of the original K701 (sold due to painful dents in the top of my head) and wonder if there is any measurable difference?  Thanks in advance!

PS  For what it's worth a comment on hedfi that I had actually found K7XX measurements here was edited by an admin, removing the reference.  I would ask what that is all about but I'm pretty sure I really don't want to know...

They don't like anything negative about products being discuss and will flat out ignore facts and measurements. I had members jump on me for telling someone, after he asked, that the QC hasn't been improved on the second batch of the K7XX. One of them kept saying that it had been improve and kept linking me to the MassDrop official response that actually states the opposite. When you call them out for making stuff up to try to get more people to buy stuff they say that you are derailing the thread and want to get back to the circle jerking.



Has anyone tried listening or measuring the K7XX without the foam on the outer caps? A member on HF removed the outer caps and there is a piece of foam on the inside of the cap that I guess is there to help boost the bass. I don't see this piece of foam on the parts diagram of the K702 Annies or the K712. Do either of those have the foam on the outer caps? It would makes sense since the K7XX didn't feel that open when I first listened to it, nowhere near as open as the K702. Has anyone firgured out what is causing the dip at between 3k-5k?

http://www.head-fi.org/t/743280/new-release-the-k7xx-massdrop-first-edition-an-exclusive-from-massdrop-and-akg/1440#post_11267219

Haha! Suspicion confirmed. When I saw the initial measurements on the K7XX, the FR wonkiness made me feel that there had to be some kind of wave cancellation affect going on to make such deep valleys. Looks like the foam knocks it down a bit. When the peaks dropping raises the valleys, it's a wave interaction issue. Those suck, in my book.

Removed the foam on the back caps. I tried to do some tests between cups and on/off but I'm not very experienced with these things. What I perceive is possibly added clarity, I dunno, I have to to 100% honest and say I'm not convinced it's not a placebo. If there is a difference in measurements between on and off I'd guess it would show in CSD plots. The only thing that has bothered me with these cans has been a slightly slow bass response on some tracks (or that is what I think it is), it makes the bass sound somewhat unreal sometimes by lingering too long or not responding too fast in a way. Anyway, if a mod ever was reversible, this one is

Can I just ask what the fuddly-duddly is going on that AKG is not cranking out the goods like they once did? It seems like everything after the K240DF and K1000 has been massive work in progress or a piece of crap. It's nice to see that the K612 and K7XX are showing that some things are a work in progress but one step forward another step back it seems with AKG. I look at this and think it's halfway beyond being able to mod the thing into a good place.

Keep in mind that I own two of their headphones and on one I can't get the bass in a good place, and the other requires 11, yes e-l-e-v-e-n, points of EQ to sound right. They take the EQ incredibly well, though.

Ug. OK. I've vented. Bipolar moment: Now I'm seriously interested in these things. If we can get some of the internal reflections under control up in the treble it should help improve its resolution while reducing the grain/grit.