Pros: Comfort and weight. Airy sound.
Cons: lack of coherence, no sub bass, harsh upper mids.
Ok, this is a headphone that I've been meaning to try out for a while. So after spending most of the day with them I'm going to give a few quick impressions. (I don't believe in burn-in mechanically with dynamic drivers)
I've listened to all my usual recordings for testing equipment, from ECM Jazz, recent top notch classical recordings, Ambient from the likes of Tim Hecker, BT, Jon Hopkins. and some favorite rock Zepplin, Black Crowes. REM.
This is just my opinion...
First impression was very good, smaller soundstage than what I was expecting but nice and airy. They are soo light! You can forget that you are wearing them.
Going through some quality classical recordings mainly symphonic and the sound is very light and weightless. Floating there. Not much bottom end though. I put some Beethoven quartets on and the bass is much better suited here. The cello sounds very detailed and punchy. Played some Jaavi Sibelius and I noticed some added texture to the strings. Nice, but not sure if its pronounced a bit too much.
With jazz I'm enjoying all the air and placement of instruments, but I'm immediately struck by a slight lack of oomph at the bottom end. By that I mean the kick of the drums with the double bass. Its very distant. There is bass plenty in quantity, only its kind of stuck at the lower mids and refuses to budge! I'm also now detecting some sizzle in the upper mids. Snare drum is pronounced or emphasized a little. I'm admittedly a bit of a tonehead so I appreciate realism more than any other attribute from headphones. So as the hours go by I'm getting more annoyed by the this. In fact this is the first headphone that has actually caused me some fatigue in a long while... (and I own HD800 and K701) Its the forward upper mids that are ringing.
Ambient music works very well with these. Because of the forward mids all of the fine details and layering come across very well. The air of these is great for creating a big floating wall of noise. Really great with this genre of music. Electronica with deep bass is great from the top to mids but they fall short at giving you any bass satisfaction. E/Qing them doesn't help at all. They just can't give you sub bass.
Rock music, I'm again a little disappointed. Electric guitar sounds great (Grado great) 'Whats the Frequency Kenneth' guitar sounds gritty and raw. Perfect tone. But as soon as the other instruments take part all focus gets lost for me. There is instant burring. This recording is commendable for its simplicity. A headphone such as the HD600 will clearly define the four instruments in use and create the space, even though they don't have that big a soundstage. What we have here is an airy sound, but the instruments are squashed too much together. Very forward and a little intrusive for my liking. I'm constantly thinking Grado. Maybe a Grado with a rolled off very top end and big airy pads.
I used a Necosoundlab dual mono SS amp for my impressions with Arcam and Cambridge audio dacs, tried them on my other amps but there was clearly a massive impedance mismatch. I would not use these with anything of high impedance.
Remember these are just my honest opinions, and I can see why peeps like them, especially if you appreciate forward mids. But I wouldn't put them up against a DT880, HD600/650, K701. All these headphone are a clear league above these. You could ask what do you expect for the price of these?? Well for the same price you could buy a lot of good used headphones that will be better or a brand new K701.