Definitely see eye to eye on this particular KZ. The DQ6 is truly like an old skool but more mature KZ to me.
My eartip set-up decreases the mid bass about 1db which brings the 7khz FR forward about 1db so I'm hearing precisely what you're hearing. The 7khz lift isn't much of an issue for me at moderate volume levels, still - I've designated a custom EQ setting for the DQ6 on all Plenues for when I want more volume. Mind you, the custom EQ setting is simply
-1db @ 6.9khz. That's it.
Using other eartips brings the mid bass back into play leveling out the 7khz rise, for me.
To my ears, the DQ6 tuning is all about delivering a natural & musical presentation with sufficient detail, clarity & air. I think the tuning was thought out and executed quite well.
That conservative mid bass with good sub bass extension keeps the presentation clean enough so I can go from classical to EDM without concern.
Keeps me wondering what $400 gets you with the Unique Melody 3DT.
The DQ6 is a revelation considering its sub-$30 price bracket and my getting backup sets was definitely the right call. I'm an unapologetic fan of the DQ6.
Thanks for the feedback.
Great job, KZ!
Bring us more DD goodness. We like it.