Originally Posted by amigomatt
Looking at the photos, they are the ones with the adapter.
Looks like a newer one, yeah. Though hard to say how new. Make sure you check out the baffle when you get the headphones - if it has a paper-like sound filter, you want to make sure there are no tears in it.
Originally Posted by GREQ
I've never heard the DF, but from what I gather (from lots of reading on headfi) it's fairly/very similar to most other vintage K240's (I own K240 Monitor and K241) - with that in mind, the vintage Beyer DT990 (which I also own) is a totally different headphone, and I'm a little surprised it's being compared to the K240 breed.
It's a much darker sound, with quite a lot more more bass and the soundstage is more impressive.
It does most music very well especially if it needs bass, but I much prefer K240 for classical, acoustic and rock and critical listening.
Still a great phone though.
Compared to the DF, I found the K 241 more focused-sounding: quicker with better imaging. Though the DF had better details and treble, which some might find the more important aspects. I'm surprised the K 241 gets so little attention - their decay, though apart from two or three ugly peaks of ringing similar to the Sextett, measures about as fast as a good vintage ortho, and their sound isn't far from one either. Not as good in the mids nor bass, but still similar in quickness.
The vintage DT 990 does sound darker than the DF, but on the other hand the DF, unlike its name would have it, takes some liberties in how it goes about implementing diffuse field equalization. They've got an extra brightness peak at 5 kHz or so, while the vintage DT 990 have what some (or just I) might call a perfect diffuse field curve.
As far as what comes closest to the DF in actual frequency response, that would be the K 250.
But then, the K 250 is probably not what most people would like, so I wouldn't recommend them in this case.