Here's a photo with a few other objects for a size reference. Sorry it's not very clear. The other headphones are Goldring DR50s.
Size wise, they're about as small as circumnaural headphones could possibly be and still fit over my ears. The headband's only just big enough at full extension to allow them over my head properly. I have a big head though.
I'm running them straight off a Xonar D2. Not sure that's getting the best out of them though and I'm considering getting an amp but it seems to do the job. Couldn't afford much more than a CMOY at the moment though. The specs would indicate that they're quite hard to drive - 100 ohm without noise cancelling and about 300 ohm with it.
As you'd expect with such different impedances, turning the noise cancelling on or off makes them sound like two different headphones. I think their sound signature was designed for them to be on. With it on, there's a slight hiss (good quality batteries help to quieten it) but it kills any 'drone' type background noises like case fans etc. The sound is very clear, quite bright - rather Grado-esque I think. There's not much of a soundstage - they're very 'forward' sounding. The detail can be quite stunning - on a par with the HD600s I tried. They can be quite fatiguing to listen to for extended periods because of the brighness though. They were rather sibilent when I got them but this seems to be improving with time.
With the noise cancelling off they're very dark, bass heavy, with veiled mids and trebles. The bass is beefy, in your face but everything else can sound distant. I can find it too much with any bass driven music, There's maybe a bit more of a soundstage than with the noise cancelling on. It can work well for some genres but I'd prefer to keep it on most of the time.
A quick word on the combination of these headphones with a Xonar D2. I found that they were so detailed I could hear compression artefacts with all my old mp3s (encoded at 192kb/s). I only really listen to CDs or FLAC now. With Dolby Headphone enabled on the soundcard, and noise reduction switched on, they're absolutely stunning. It adds the soundstage that the headphones are missing. With Dolby Headphone on, it's the nearest I've heard to a transparent headphone. It would be very easy to forget I was wearing them, shut my eyes and imagine myself there as the recording was being made. I've tried Dolby Headphone with DR50s, DR100s, various philips and creative in ear buds etc. It sounded fairly artificial on everything but these and the HD600s.
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