Well I think I've listened to them for a pretty reasonable amount of time to at least attempt to write a quasi-review. Keep in mind as you read that I'm pretty new to this hobby.
First I'd like to say the headphones that I have and listen to the most. I have the 2005 version DT770/250 that I listen to above 80% of the time. I also have the Koss KSC75 recabled that I listen to on-the-go, which is about 20% of the time. As far as my setup goes, it's usually flac files to Number Cruncher 205.2 via optical cable (from X-fi platinum), to PA2v2, to headphones.
When I listened to these phones for the very first time, it was with a stereo receiver through the headphone jack. The first thing I noticed was that the bass all the way through the mids was really well represented and full. I didn't need EQ up the bass or mids at all. I thought they sounded really good just listening to FM radio on a jazz station. That night I decided to hook up my CD player and listen to some CDs.
The longer I listened, the more I noticed that the treble on these phones are a lot more recessed than my DT770s that I have gotten so used to. I plugged them back into the stereo receiver and cranked the treble on the EQ all the way up and it started to sound more like what I was used to on the DT770s or KSC75.
They sound really good with jazz recordings that have the sound of
Kind of Blue imo. Other genres though that I have tried with them don't sound quite as good. I listend to a lot of rock and some classical. Rock/metal sounds pretty decent but not up to the same standard that I'm used to with the DT770. Classical sounds pretty good but still the treble is a little lacking.
With the treble EQ'ed up these phones acutaully sound really good. The mid-bass through the midrange is really up front compared to the treble. I think the bass actually gives my 2005 DT770s a run for their money! The bass extends really deep and very full, but a little less tight than the Beyers. Overall these phones are really good for music that benefits from lots of response in the mid-bass through upper midrange frequencies. I like them a lot for jazz and somewhat for classical, but I prefer my Beyers for music that needs really good treble resolution. If you come across a pair for a good deal you might want to give them a try. You might be suprised.
PS. I was listening to Norah Jones while I was writing most of this and it just sounded great
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Let me know what you think of my first lengthy headphone review ever