frix, you might like the HP100 sound signature better than the Momentum because it it's more similar to the HD800 but that doesn't mean that the Soundmagic is actually more transparent than the Momentum.
What do you mean by transparency?
When I talk about transparency, I talk about the ability of portraing sound clearly without headphone related artifacts (echos, ressonances, weird FR, distortion, etc...).
This is not a purelly subjective thing it's something that can be, to a certain extent, interpreted through measurements.
Note that you can have a colored, non neutral headphone that still sounds reasonably transparent.
In this sense Transparency has nothing to do with sound signature.
But you can improve the accomplishment and effectiveness of a certain sound signature if transparency is improved.
Regarding transparency, by the above definition, the Momentum is without any doubt way beyond the HP100.
Technically the Momentum is much more impressive than the HP100.
The Momentum is actually much closer to the sound quality and transparency (a subset of sound quality IMO) of the HD600 than it is to the HP100.
It also has a rather reminescent sound siganture of the HD600, IMO.
Edited by kkl10 - 4/5/13 at 6:07am