@soundstage77a its funny that your name is soundstage and you like the one with smaller soundstage... that means nothing.. i just wanted to say that.
thanks for posting... technicalities aside there is a lot to like about the momentum. The warm and full sound with forward mids makes for a good enjoyable listen with nothing to complain about really and you can just enjoy the music.
Most of these new high-end fashion headphones are brilliant but everyone sees and hears things differently.
For example, I like the sound of the new K545, but I wouldn't be seen dead wearing those (*shudder*)
Also I prefer the sound of the Momentum to the K545 because the K545 sounds thin and boring to me, and the timbre and tonal balance of the momentum sounds more natural to my ears.
Some of the newer (and more expensive) headphones are technically better than the Momentum, but to say it is being outclassed is a bit heavy handed when it still puts up a good fight in many aspects and is in no way a bad headphone for the money, especially when considering the absolutely dismal offerings from other similar priced headphones from brands like Monster.
I think it's going to be a difficult choice, but if I were you I'd go with the NAD. I don't see why anyone would want to own ONLY similar sounding headphones.
Why settle for enjoying one type of sound, when you can just enjoy them all!
Try to think of the curve as a bass/mid increase rather than a treble dip.
This really works in noisy environments where low-mid and bass perception is the first thing to get affected by noise.
So when you turn up the volume to compensate, you aren't bombarded with piercing treble and high mids.
The result is actually rather spectacular.
In quiet environments the other headphones like NAD, B&O H6, M500 etc are much better choices. But my commuting experience since the end of 2012 couldn't be better (aside from getting some fancy IEMs)
i dont rem hearing the treble dip like that but man I cant recall a graph showing one that steep ever. that is not just a little one... but if you say so