Hey head-fi. I am posting this on behalf of one of my friends. He is looking for a pair of closed-back over-ear headphones for traveling. That means very good isolation, no sound leakage (good seal) and comfortable for long periods of time. On top of that, he has a wider head, if that is to be considered. Preferred signature is unknown, but I will get it as soon as possible as well as his price bracket. However, I am also interested in buying a pair of headphones that match this criteria. My preferred signature would be that of my he-400's with a bit less treble and bass (so more neutral while retaining a light v, preferable with a larger sound stage and lots of detail). I am looking in the sub-300$ range (that also includes 300$ used), but suggestions in lower brackets would also be appreciated for my friend. Thanks!
Josh

My experience with closed back headphones is the Bose QC15, Sennheiser Momentum and Denon D2000 in that price range. The Denon doesn't provide good isolation but sounds great and has a signature that I think you'd like. They have been discontinued and would be hard to find under $300
 
The Sennheiser Momentum is a great sounding and light headphone and provides some noise isolation. I really like the sound of these but they are on the warm side, not neutral.
 
The QC15s provide active noise cancelling and I love them on an airplane, they're fantastic in that respect. The sound isn't great compared to headphones without noise cancellation in that price range. Not much bass and subdued highs. They don't sound bad but it's a trade off.
 
I've heard really good things about the Focal Spirit Pro headphones being great sounding, neutral and a great value. From what I've read you may want to look into these although I have no experience with them. Good Luck!

I forgot to add, I also have a pair of dt 880's that I really like, but the treble is just too bright for me and it sometimes sounds a bit thin, although I assume that is caused by it having less bass then I am used to. I have a few headphones I was considering:
B&O H6 (super neutral, however I have heard they sound tinny. Perhaps someone with experience can interject) 
AKG K545 or 551 (not sure about what the difference is other than cup size)
NAD viso HP50
B&W P7
 
My first priority is sound quality, so the QC15 is off the list, as are the momentum's due to the too-small cup size. Maybe the Denons if I can find em for a steal. 

I have heard that the denons have a bit of a flabby bass. I honestly cannot stand muddy sounding HP's or lack of detail. Would the ah-d2000's fit the bill? 

tacgunner1 said:

  I have heard that the denons have a bit of a flabby bass. I honestly cannot stand muddy sounding HP's or lack of detail. Would the ah-d2000's fit the bill? 

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Yes, especially with Lawton pads. (I didn't like the treble though, which sounded screechy.)

Then I think the d2000 with Lawton pads are a no go. I have the dt880's and the treble is way to harsh for me on some tracks for me. I am considering buying a pair of T50rp's and modding to match my signature sound. If I can buy them for 70 and mod them to match, I could save myself quite the penny.

That will require some patience, more than I have. Good luck!

Thanks! I will probably end up on the DIY page looking for inspiration , but I hope it turns out! 

Best to start here: http://www.head-fi.org/t/618659/fostex-t50rp-incremental-mods-and-measurements.

Don't forget Phiaton MS500 Bridge