received my XD400's today. i'll try and keep this short, since soupy's review was pretty much dead on and i'm just reiterating it. anyhoo...
shipping from audiocubes was typical time and packaging.. nothing special here, but like clockwork for customers in Vancouver, BC.
first thing i noticed was that these things were gonna dwarf the 'cutesy' d66's, not to mention the size of my head. (more on that later..)
after removing it from the packaging, i found the same things as soupy did. no surprises.. typical sony japan packaged accessories.. (extension cable and 1/8" to 1/4" gold-plated adapter.
the headphones are lightweight, weighing in at a 260g (marked on the box), but have a lot of bulk on the outside of the cups made entirely out of plastic.
sizing may be an issue for some small-headed users.. i have a (hat) size 7 - 7 1/8th head and the auto-adjusting strap is barely effective. don't get me wrong though.. they fit snuggly on my ears and and rather comfortably. it's only an observation/warning and obviously won't be a problem for those with large craniums as it seems someone with a size 20 head could use these without too much of an issue.
i should also point of that soupy was indeed right about the look of the XD400's.. don't wear them as portables.. you WILL get laughed at. it would definitely be sony's closes attempt at having an equivalent to the K1000's for making an audiophile look like a audio-dork. HOME use only boys and girls.. HOME USE ONLY. hehe..
as for sound.. it's rather impressive. the 50mm drivers definitely move quickly and accurately without any piercing highs or fatigue. i should add that they run very well directly off my hd1 with a 106dB/mW rating and even better amped, in this case with a headroom airhead.
the vocals are very crisp and when called upon, the bass held up very well accurately on bass-heavy tracks. for vocals i used sample tracks from the phantom of the opera soundtrack and for hard hitting bass i pulled up some 'money and hoes' hip hop tracks. i should add that bassheads will definitely get a kick out of the bass prowess of these 'phones.
overall, i am very pleased with my purchase and its addition to my sony stable of headphones. i'm not gonna kid anyone into believing i'm as knowledgable as most of the head-fiers out there, but i know what sounds bad and the XD400 do not. they are definitely worth a listen, especially for their price.