My Eikon finally arrived. I haven't been this impressed with a headphone since I heard a well driven HE-6 or a well matched HD800 system. While I wouldn't quite rate it at the level of those two, the resolution and tonality are still phenomenal. The quality of the finish is the best I've seen from Zach yet, and it feels very solid while weighing much less than Zach's initial estimates. I'd guess around or slightly under 500g. I've been using it with an NFB11 after my attempt to downsize. The Eikon reveals gears exceptionally well and its taunting me to upgrade. That's a good thing from a technical standpoint, but not financial.
Do note that due to the swivel and heavy cups the Eikon is like a small child. It wants to kill itself at every opportunity so be careful with handling it. Its a slippery (not-so) little guy.
Quick impressions (subject to change):
The overall tone is neutral leaning, but slightly U-shaped I'd say. Very much not your usual ZMF.
There is a bass hump and the bass extends to around 30hz before rolling off at all. The bass is clean enough and the transition from bass hump to lower mids is sharp enough that I don't detect much bass bleed if at all. The bass is boosted just enough that a bass guitar low in the mix can be obscured a little bit, but its not a major complaint yet. I will say the Eikon has the same bass feeling of "shock and awe" I get from the HE-6, though it distinctly has its own texture that is unlike planar bass. On lean tracks the Eikon is lean, and on bombastic tracks the Eikon is a weapon. No intrusive boosting or coloration in the bass from what I can tell. The bass doesn't quite slam like the HD800 and its not quite as well integrated as the HE-6's bass, but it is extremely clean and satisfying.
The midrange is clean and very detailed. It might be ever so slightly recessed, perhaps ~1-2dB between ~300-800hz (rough estimate) which can make vocal take a slight step back. The upper mids are forward, but not glaring or fatiguing. Reminiscent of the HD650/HD580 upper mids, but cleaner and without grain. Great separation and tonality in the midrange which is what makes or breaks most headphones for me.
The treble is new territory for ZMF. I'd describe the treble as slightly north of neutral. Not a bright headphone, but with a brightness and sparkle to it. There is likely a dip somewhere in the cymbal region (which doesn't make sense since the region is broad
) as I find that cymbals are much more balanced and unobtrusive for the overall treble presence that the headphone has. I never found the treble fatiguing, but I'm not stranger to enjoying bright headphones.
Soundstage is solidly intimate, but imaging is excellent. Detail and dynamics are extremely impressive, and I'd say just a step below the greats like the HD800 and HE-6 but above that of the LCD-2/3/x/4 HE-560 and HD6xx.
If the Eikon were open back, it would be worth $1300. Since it isolates very well I'd say it is a peerless closed back headphone and an astounding accomplishment.