Here's my assumption on MIDS and how pads affect it.. EQ and Amps can and will alter volume levels, but we're not talking about changing a sound electronically.
Neutral has all three in good balance. Nothing beats anything else. Once you start emphasizing something, there will be a sacrifice somewhere else
Heavy bass, heavy mids = rolled off/non-sparkly treble (i.e. ESW9, HD650)
Heavy Bass, heavy treble = recessed mids (i.e. most popular basshead cans, like the DT770 Pro 80)
Heavy mids, heavy treble = light bass (i.e. AD700, K701)
Th J$ pads are taming the bass, bringing out the mids, because the bass isn't as LOUD. I honestly doubt it makes the mids LOUDER, it just makes them easier to hear. It's the same as amps that roll off the treble. Since the treble isn't as energetic and loud, the mids become easier to hear.
I believe with all my heart that there is no such thing as gaining ground somewhere without sacrificing something else. If you want more mids, you're gonna to an extent lose either some bass or treble.
I have never heard the LCD 2, but people call it a very balanced headphone. I'm gonna go out on the limb here and say that if it is indeed as powerful in the bass department and as clear in the mids as people say it is, I guarantee the treble isn't gonna be to my liking, as it will undoubtedly be smoothed over.
The D7000 has a pretty gentle v shaped sound. It's colored enough to keep enough of the three to keep me completely happy. I don't need anything more, as I'm not willing to sacrifice the bass or sparkle to bring out the mids (which I'm extremely happy with anyway).
Seeing as I don't like neutral cans as they sound boring to me, I definitely want a colored sound that has bass and sparkle. The end result will be mids that won't be as loud as the lower and upper extremities...
I'm not a basshead. I'm a subtle bass and sparkly treblehead. Since my main emphasis will be on treble, there will be enough bass and mids to fit my needs.