I have an update to report with everyone.
Technically, both of the Beyers have not left my house yet, so I decided to compare them once more. But this time, I threw in the AD700 to the mix, and was surprised with what I heard.
Between the DT880 and the AD700, it was apparent that the AD700 was actually brighter than the DT880. That, and the fact that the DT880 had much deeper bass, were the two things that stood out most. The DT880 sounded like it was a bit more full, with more body as well, as the AD700 just sounded too airy. AD700's treble was a bit sharper as well, and DT880's was more refined. If I had to represent music as a piece of paper, the HD650 would be printer paper, the DT880 would be tissue paper, and the AD700 would be a window screen. I'm sorry to report, I honestly couldn't place the DT990 into a category because it is so strange. Anyway, more on to that in a second.
My advice is, if you like the AD700, then I highly suggest the DT880. It has more controlled, and smooth treble, much fuller bass, and a more refined sound. A perfect upgrade to the AD700.
Now, between the AD700 and the DT990, this is where the fun begins. Both of their treble really surprised me in a way, it was hard to identify them and place a label on their type of sound. The AD700 was a bit easier to describe, and I did so above. It is in fact, the ultimate "upside down pyramid" between the three, possessing very little bass. But get this, I preferred the AD700's treble to the DT990's treble. The AD700 had a very bright, and airy treble, being a touch sharp. This led to fatigued listening only after a few songs, unless the volume was turned down. (Turning the volume up a bit is a good way to identify treble quantity and quality). But the DT990 on the other hand, once again, it's a sick and twisted headphone, with a sound I still find hard to write down, yet I find it very distasteful. The treble on the DT990 sounds more metallic than the AD700, and it also sounds "veiled" in a way that the veil acts as "tin foil". It shimmers a bright and very unnatural sound across the top of the spectrum. It actually sounds like a more, hollow, sharp, upfront, and distorted treble compared to the AD700. That mixed with the enhanced bass (compared to the DT880) makes it THE weirdest headphone I have ever listened to.
I also compared the DT880 to the DT990 yet once again, and my OP review still stands...
Some advice to AD700 users. If you have the AD700 and you feel pressured to upgrade to something better, just remember, you don't have to. The DT880 and the AD700 don't sound as different as you think. Yes, the DT880 is a more refined, and full version of the AD700, but the difference isn't mind boggling. That is something I wish I had learned back before I went spending on all the headphones in my inventory. (But, if this *really* is your hobby, and you listen to music A LOT, then upgrading would be a beneficial).
Also, I do not hate the DT880 contrary to what some think. It's actually, like I mentioned a page or so back, on of my Top 3 headphones. I just find the sound of the HD650 to be superior. But, even if I really liked the DT880, I would probably have to let it go due to it's comfort. I'll have to rank the HD650 more comfortable than the DT880 by a long shot. And the AD700 more comfortable than both of them by miles.
Edited by Katun - 12/8/10 at 7:44am