Initial Impressions (Remember, I'm not so good at sound vocabulary yet.) -
Gear used: Toshiba CD Player SD5200 --- > Stello DA 100 ----> Headamp GS - 1 -----> LA7000/Open Back Mod D2000. (I have no idea how the original D2000 sounds like btw)
First off, I would like to begin by saying that the brightness/sibilance are not problems for me. In fact, I like the sibilance as it brings attention to the vocals. Generally, I like the way it sounds as a whole. The sound is aggressive, and sounds seem to be directional (coming from somewhere).
Lows are subtle, present and tight. However, It feels that the bass is quite light. Bassheads might not like it. It feels little, but present. Apparently, the bass on the D2000s do not sound that great either, so this is considered an improvement from the stock. I have the LA7000 though, so the bass on this cans just do not sound that great. It lacks weight. It's defined, but lacks weight. The bass on the LA7000 is far more defined, far more punchy, far more weighted, but smooth and not overpowering.
I think the mids are where this mod shines. It's very defined, and you can hear it fade off nicely. Sounds are natural and clear. Also, it's detailed. One really nice aspect of the mids is that it is more bright and more in your face (aggressive). Most people don't like it, but I find that its brightness brings live to the songs. (The sibilance can be adjusted by shifting the pads closer to the driver btw. The closer the pads are to the drivers, the less sibilance there is, but the more aggressive and close sounding it becomes.) The sibilance also brings live to the songs. There is depth and movement in the sounds which makes it sound more personal. The mids also gel very well with how far the sound sounds. If the song has sounds that sound further away, the mod will be able to make it so, but at the same time make it sound accurate. Imaging is brilliant. I guess that is what you call soundstage!
The highs are also great. Treble is sparkly and a joy to listen to. They have the ability to be sparkly and not be TOO tiring. I can understand why people will find it tiring, but frankly I like it. The highs provide contrast to the low bass (or tries to), and it is very nicely brought out.
One other aspect of the cans that I like is that, it has both the energy of an open can, as well as the original sound signature of the D2000s. It draws a fine line between these 2 attributes.
If I have to compare between the LA7000 and the D2000, I would choose the LA7000 over the open back mod any day. However, I would say that they sound different from each other in that one sounds like an open can, and the other a closed can. The mids of the open back mod sound are almost as detailed as the LA7000 in my opinion, but the bass doesn't bring it out like the LA7000 does.
The LA7000 are also more laid-back and less aggressive than the D2000, providing a more wholesome sound. It's smooth, but doesn't bring out any particular attribute of sound. I prefer this as I like to pick out the detail of the different tiers of sound on my own. However, when I am lazy, I would prefer the Open back mod as it's more bright and aggressive in this regard.
I have no idea how it compares to other open cans other than the AKG 701. I like this mod more as it is less bright and more musical than the AKG 701.
That being said though, it sounds good. I can say that I will be finding myself listening to this set of cans despite owning the LA7000!