Okay!! I just came back from the local Best Buy Magnolia with some experiences to share!!
(pretty excited since this was my very first time listening to "hi-fi" headphones)
The only 3 notable models out for demo were the Momentum, the D600, and AKG K550. Only preset songs were available. I listened to "Move Likes Jagger" - Maroon 5 and a familiar sounding classical track whose name I didn't know. So anyways...
D600
I've always wanted these and I grabbed them first. Despite what some think, I really love the curvy design.
I readjusted the extender thingy to all the way back as the headphones kept falling off my head, but they were still kind of big. I felt the bottom of the earcups extended too low and created a slightly awkward feeling.
I put them on and started "Moves Like Jagger". The first thing I noticed was BASS. I don't think I've ever heard this much bass. "Moves Like Jagger" has a lot of thumping bass throughout the song, especially right at the start. In fact, so much that at first I felt a little nauseous/sick. It improved over time, but, never thought I'd say this, but I still found the bass to be a little too much.
For the classical track, these weren't too bad. Not much to say since my time was limited. I think the difference is comparable to the Momentum, but of course, I didn't get to listen very long or carefully.
Annoyed, I put on the K550s. Hmm, not too bad. The lighter bass was welcome after the D600 pulverization. I thought the vocals and (highs?) sounded better on the D600s though. For the rest of the time, I mainly switched back and forth between the Momentum and the D600.
Momentum
Too be honest, I wasn't expecting these to be better than the D600. Maybe because they looked smaller or something, not sure. Anyways, I put them on, started "Moves Like Jagger" and just... WOW. The clarity of the vocals and highs was something I've never heard before. Adam Levine definitely sounded better on the Momentum over the D600. Bass was MUCH more tolerable and along the lines what I am looking for. I continued switching back and forth between the D600 and the Momentum. I think I like the sound of the Momentums more overall.
On the classical track, again, not much time spent on it, so not much to say. I
think the Momentum sounded slightly better, but not too sure. I think some rings of (the harpsichord?) sounded more "euphonic"
~~~~
Based on this experience, what should I do now? Do the D600 change much over time or do they stay that way?
Are there any headphones that are similar to the Momentum?