So it has been a few months since I bought the Zen dac Signature. Today I have just got the Zen can 6xx. It looks gorgeous in reality.
I connect the dac to the amp via 4.4 to 4.4 balanced cable and use a 4.4 to mini xlr cable with my LCD2 rev2. Here is my quick impression of the Ifi zen 6xx combo (the Zen dac sig is on firmware 5.3c)
1. It have a sweet sound. There is no glare or distortion that makes me irritated (like the sounds from almost Schiit stacks I owned)
2. Though the bass is delicious and full on the 6xx eq setting there is no claustrophobic feeling (again compared to many Schiit recent amps)
3. The eq functions were done gracefully and thoughtfully. They are not like useless gimmicks for selling purpose or are overdone. I really like using those eq presets a lot
4. I got the emotion and desire to listen to one more song and one more song..
5. The amp is quite hot after about 1 hour continuously working. And it isn’t like some other reviews I have read, there is no sense of lacking power or clipping or whatever. I use the highest gain (18db) and think it sounds the best. My volume knob indicator hasn’t never passed 10:00 position paired with my 70ohm LCD2 rev2 and the dac is on fixed mode.
Conclusion: I really like my Zen sig combo. I think I can use it for many years without the longing for the next upgrade. I am listening to the combo for more than 2 hours and typing this impression. I haven’t found any cons of it yet. A joyful listening of many of my fav songs with different genres and languages. If nitpicking I wish the Zen sig combo have a little more plankton in its sound so that it will have a more tangible and real and natural sounding. But it is nowhere close to be as simple or "too clean" or boring or harmonic-erased as on some trendy chip-based amps or dongles.
Sorry for my English and let enjoy!

Hi,
I used the J3 with vsonic gr07, sony ex1000 and don't think it is a very good sounding PMP.

Headphone: LCD-2 rev2
Comparition amp: Schitt Asgard v1
I can't tell how much i love my new Schiit amp - the Mjolnir.
However, i remember the mids on my LCD-2 was more thick and blooming previously IMO.
Maybe it causes by adding a bulk of quality and quantity into 2 top-end regions.
And i also feel there is a little stretching in high regions. You know, it is as a singer trying to sing very high notes but it is not her strength (obviously not Mariah Carey ^^! )
She can still perform OK, but you will feel it is slightly overdoes and not natural.
 
But to those who want the Audeze house sound to be less 'dark'. I think it would not be a big deal. And i still love my beloved LCD-2's change to death
5 stars satisfaction purchase!!!

Pros of Audeze LCD-2 R2:
1. Midrange (natural, detail, seduction..->phenomenal mids makes even harshest rock or terrible mordern electronic pop sound super smooth and emotional/touchy but still full of energy)
2. Treble (oudstanding quality and natural treble, slightly lacks the quantity though)
3.Bass (Very detailed, fast, tight and powerful bass. Although I know it will be hard to implement this for such an open and top-tier hi-fi headphone, BUT a little more kick, impact, solid at mid-bass and bigger amount at sub-bass would become perfect )
4. Good design and material (excepts the stock cable and tough pads)
Compared headphones: few Denon, Beyer, grado, Sony fullsize models, jvc, sony, westone..iems

If i rate the W4 is 10/10, Xba-4 is 8/10. The W4s are Ok at every expect but lie down a setback note from the W4s ability. Only one thing which the Xba-4 is better than the W4 that is: the Xba do not have the zz zzz sibilance sound..
The biggest issue on this new Sony flagship iem is having a freak noise when playing music and the smaller one is no-unique sound signature.

Well, i am a bass-addict and though the bass on this JVC's flagship iem is really outstanding, i really can not love it unless i am considering this bass separately. Yeah, it will be the most iem's subwoofer-likeness bass if it is standing alone. But in this case of the FX700s, the bass affects too much at the mids once you listen to a (semi)heavy bass song. For example: jpop, kpop, hiphop, dance and even R&B =.=
 Besides, the general sound of the FX700 is too thick, too color (not dark though) and seriously lack of the detail in the mids, esp in the treble and having a plastic treble like that is existing on almost models of the Denon's sound signature.

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Update on my 2nd time purchasing the GR07 in March 2013..
...more about the GR07: warm mids
IMHO:
Sound: 8/10 (compared to the best iems i have ever had was W4 and Ex1000 10/10)
p/p: 10/10

The first,i want to say "hi" to all of  headfi-er here and i'm sorry about my bad English cuz i from Vietnam. So , i will make my 1st review as short as possible in order to avoid the vast of error grammars that always occur every time i try to write a refined long english passage :d
 I have previously owned a pair of Vsonic Gr07,the Bose in-ear and listend to the Beats Solo by Dr. Dre On-Ear, the yuin pk2s and the soundmagic pl30s. Seriously, it is not fair to compare a IEM vs a fullsize(Denon a100 is portable-fullsize thought) but i feel the Beat solo even don't come close my GR07, so i think using only the gr07s which is the best in my experiences and gotten a lot of praises in the forum is a good thing to describe how the A100s sound. The A100s are over the GR07s in almost aspects: they are much much detailer, fuller, more fun with deeper and solider bass, the treble is laidback compare to the shrill treble on GR07(i just detected this after sticked to A100 instead of GR07 for several days), the soundtage and 3D image is really great too(i know it is fullsize's powers), the isolation ability on par with GR07. The only thing that GR07 win in this battle maybe MID. When i listened to few songs of Mariah Carey, i realized something missing and i don't have the emotion "creepy satisfaction" like having on GR07, it because A100 have the Mariah's voice is smaller and comes from further place. We know the GR07s 's mid is wonderful and forward (i race GR07 30% bass, 40%mid 30% treble on SQ) and Denon's style is slightly V-shape then we are easy to understand this issue. Finnaly, i put 4. 5 stars at audio quality to this Denon 100th anniversary headphone and i think they worth any pennies of mine.