Great "airy" sounding headphones. Really comfortable. A bit unruly cable.

I bought a factory refurbished set from buydig via eBay. They arrived in a plain box, wrapped in a sheet of foam on the plastic insert in the retail packaging. I can't tell that they have been used before (if they even have been). Ok, so now with that out of the way - the sound. I should say I've only run these a bit more than twenty hours as of yet, but as they are refurbished maybe they've run longer in reality. I'm going to start of with saying I'm really fond of the sound of the AD900X's. It's got a really wide an crisp kind of sound, with a fair amount of bass. The question of bass was one of the things I was a bit worried about when buying these headphones, since the reviews I found said they were primarily good for vocals mid's and treble, but even if my Sony MDR-XB700 pack more of a punch the base is much clearer and nicer in the 900X's. That said, I have to agree with the other reviewers - the mid's and treble is really where this pair of headphones shine. The "Air" tagline of these headphones is a really good word for them. Also, I really like the 3D wing system, although I was a bit skeptical at first - they were so light on my head I thought they were going to fall off and there was no pressure at the top of my head (since the sid more to the sides). But after getting used to them I love their light touch, and they haven't fallen of yet, even when shaking my head a bit. But I guess if you have a smaller head (mine's pretty standard sized I think) the wings might not grip on as well. On the negative side, I'm not too fond of the cable - it's really got a mind of it's own twisting and twirling. A detachable cable would have been great to switch between different cable lengths for different uses, and it would have been much easier for me to buy a cable I like and use that if I wanted to. Another thing to think of that might be negative is that the person next to you will have to listen to the same music as you do, but that's a problem with any open pair of headphones, and there are definitely worse open headphones when it comes to this. I bought a couple of headphones at about the same time and of them these are my favorite ones so far. Hifiman HE-400 - really crisp as well, but the sound doesn't seem to take off the same as the 900X's, and the bass isn't as.. hmm.. nice and "airy" for lack of a better word. AKG K550 - has a bit of a boring sound when compared to the 900X's. The sound is there and it's crisp and full. I can't really put the finger on it, but boring is the word that comes to mind.Read full review