any estimate on how it will be before this technology is adapted into any production hps?

how about the klipsche s4i?  they are of decent sound quality, isolate well, have the optional 3-button/mic for iphones/ipods.  they can also be had for fairly cheap.

is the shure srh840 sound quality noticably better than the srh440? 

momentum vs. hd 25 ii?

i was wondering what the top closed back headphones are within the $150-$300 price range, i have some experience with the senn hd 25 ii which i very much enjoyed, but was interested in other alternatives available.  shure srh840?  others?

how do these compare the hd800?

thanks for that!

justify the price?

for long durations of listening, are these preferable over the hd600/650s in terms of weight and fatigue?

how does the weight of the he-400 compare to the he-500 and senn hd600/650?  which would be preferable for long listening sessions (several uninterrupted hours)?

how does the weight of the hifiman he-500 compare to the he-400?  noticable difference in comfort?

how does the weight of the hd600 compare to the hifiman he-400?  is the difference significant?

sennheiser hd 650 vs hifiman he-400, any new differences in their latest revisions?