Okay, good news (and it shouldn't be a surprise to those who know just a teeny bit of dac/amp knowledge. I'm a rookie at this but even I figured this out).
The E7 works WONDERFULLY as a DAC in between your source and the E9 (via 3.5mm to Line In, meaning NOT having it docked). I honestly can't tell the difference in sound quality between this method, and having it docked with the E9. HOWEVER, doing this method ALLOWS you to use the EQ settings of the E7 with the E9! YES! That means that even though you don't get the aesthetically pleasing docked E7, you do gain the ability to tweak the sound with those EQ presets! It'll be pointless to do so if you like your E7 with the EQ seting at 0, but for everyone else, it makes your E7 as useful as before. Lemme tell you, EQ 1 works for my K701, as it ever so slightly warms up the sound and raises the bass just a very teeny bit. Not that I need it now... as I enjoy my K701 with EQ 0. That's saying a lot as I didn't even like my K701 with music...now I can't get enough!
Fiio, PLEASE oh please include an update to allow the EQ presets with the docked E7! It's not necessary, but it is an easier solution than using the E7 via Line In, as the dock is there to serve a purpose!
I dunno if it's just me, but the treble of the E9 (while still prominent) has toned down ever so slightly, to the point where I enjoy the K701 even on the dock hooked up to my netbook.
Listening to: Pendulum - Salt in The Wounds. This is an instrumental that features a solid basslike and treble that can EASILY become sibilant. Last time I tested it, it was pretty much borderline sibilant, but now is just ultra crisp even with the K701. And guess what, even this song sounds enjoyable on the K701, though the DT990 just REALLY showcases what solid bass it has...
Gaming impressions coming soon!
I'm currently having waaaay too much fun with my K701 and docked E7/E9. It sounds....AWESOME. The bass is definitely not missing in the K701, just reserved.