These are 3 new portable headphones, I ended up buying all 3, since most people probably do not get to test them all together I thought I would write my impressions of how they compare. Any impressions of the UE6000 are in passive mode.
Comfort : UE6000 > Momentum > M-100
The UE6000 are possibly the comfiest headphones I have ever used, the momentums are a bit small but if your ears fit inside the cups then they have enough depth and are pretty comfy. The v-moda are not good for comfort, strong clamp, no tilting ear cups and shallow / hard pads not good for comfort!
Bass quantity : M-100 > Momentum > UE6000
Bass quality : M-100 > Momentum > UE6000
M-100 have the most bass and the best quality as well, although if you have to mod the Vmoda to fit your ears then this messes the bass up, un-modded the M-100 take the basshead award. UE6000 have good sub bass but the mid bass is a bit loose and weak in passive mode. I like them Momentums bass a lot and it goes right down to the limits of hearing.
Lower midrange : Momentum > UE6000 > M-100
As usual sennheiser has awesome lower mids, natural and smooth. UE6000 are surprisingly good here as well, especially for the price, M-100 are not so good here TBH, the mids are quite hidden behind the bass. The momentums have a really nice, punchy and fast sound, reminds me of a nice pair of stand-mount speakers.
Upper midrage : Momentum > M-100 > UE6000
Momentum is the best here again. M-100 are good although they do not have the transparency and realistic tone of the Momentums, good in their own way, just not very realistic or natural. UE6000 are good but not great here, if they were not being compared to 2 headphones which are twice the price they would be good.
Lower treble : Momentum > M-100 > UE6000
The whole treble response of the Momentums is good, it sounds even and does not have any obvious peaks, it has a very slightly harsh sound although good overall. The UE6000 is very dark and has a slightly sibilant and grainy sound, although not bad at all. M-100 are pretty recessed in the lower treble and technically not great but somehow it works quite well with the rest of the treble on the headphone.
Upper treble : Momentum > M-100 > UE6000
The M-100 has a big treble spike at 8-12Khz which pretty much makes up most of treble of this headphone as everything else in the treble region is quite recessed, this makes the treble sound quite thin, although good for electronic music. The momentum sounds even in the treble and more natural compared to the M-100 as you can hear the whole of the treble evenly from 5khz all the way up to 20khz. The UE6000 are OK but just not really as good as the other two and too dark.
Soundstage : M-100 > UE6000 > Momentum
I find the M-100 is bigger than the others but a bit unnatural sounding, it is good, just not very natural and sound a bit odd at times. If I could change one thing about the Momentum it would be larger cups and larger sound-stage and this does spoil the momentums a fair amount. UE6000 is decent, does not really do anything wrong, although nothing very impressive either, this pretty much sums up the whole sound of the UE6000.
Overall sound : Momentum > M-100 > UE6000
The Momentums just have a really nice sound that has no real weakneses and sounds great from the bass to the treble with no weak points, except for the small cups and soundstage. The M-100 are a bit uneven for me with the bass and treble peaks, but somehow it works well with certain genres, although these are not all rounders, they are nice with some genres. The UE6000 are good value for around £100 if you can get them for that.
Overall sound / value / comfort: Momentum > UE6000 > M-100
Momentum are the best overall headphones if they fit you around the ear, UE6000 are a solid headphone which are good if you can pick them up around £100, M-100 sound good although I feel they are a bit over priced at £280 and only good for certain genres. The genres that they are good at though, they do well, once you have got used to the slightly odd sound of them. I think the M-100 are really good at electronic or synthesized sounds, but not so good when it comes to reproducing real sounds, voices, instruments etc. best on a budget UE6000.
Edited by nicholars - 6/29/13 at 10:58am