It does look like an interesting headphone. Anybody heard it yet?

I own a pair now I like them.

Some of this is copy pasted from a little article I wrote comparing the R70x and the AD1000x:

The R70x is the least 'Audio Technica' sounding headphone I have ever heard from Audio Technica. The Audio Technica house sound tends to be quite sculpted, with a emphasis on the upper mids and a de-emphasis on the bass. AT cans are considered by many to be masters at female vocal delivery and an open, airy kind of sound.

The R70x is definitely a departure from that sound, with a much more balanced presentation with no strong emphasis in any particular frequency region. If anything, it tilts towards the lower registers - not because it's a bassy can (again the key word is balanced) but simply because the treble is polite and doesn't really steal focus.

Over the past days I've had a really enjoyable time with the R70x because it's an excellent all rounder well suited for long listening periods.

Think of it as a more solid sounding Sony MDR-MA900. It's doesn't seem to have as much clarity or detail as my AKG K712 (maybe because of the polite treble) but the low frequencies are a little more satisfying.

A lot of people want to see how similar it is to the HD600 (they seem similar based on description) but I haven't had the chance to do a direct comparison myself.

By low frequencies being more satisfying than the K712, what do you mean exactly? Cleaner, more slam, more overall quantity, or what? (And, of course "more satisfying" to you may mean less bass in comparison.)

I haven't quite put my finger on how the bass compares to the AKG K712 in terms of control and slam. The R70x just has more of it than the K712, which I find satisfying. Not that the K712 doesn't have a lovely bass response. The R70x just sounds richer.

So this sounds like the opposite of their existing open headphones...more bass, more polite treble. Too bad you haven't compared directly to the HD600/650, because I'd be most curious about that. Gotta say, though...R70X sounds appealing after what you just said.

Yes, its basically the most 'un-Audio Technica' Audio Technica open can I have heard. I will try to compare to the HD600/HD650 when I get the chance (many many people have asked this question) but my gut feeling is that it isn't dramatically better or worse than the Sennheisers.

So does the K7XX have more bass than the K712? Or just more than the K702? I've always been confused about that.