I've got a new favorite gaming headphone and it is my HD-598 killer. HD-598 isn't nearly as good now unless it's just soundstage size.
It's this ugly Frankenstein DJ100 I made. Converted my Koss Pro DJ100 to open with the HD-497 shell and then recabled it with Mogami:
This is crazy, but now I'm about 90% sure the soundstage is now larger than that of the HD-598 when open. It's confusing a bit considering it's so small.
When closed, the DJ100 is quite a good closed headphone, but no chance I'd use it as my primary gaming headphone unless I HAD to use a closed headphone.
The thing is small and ultra comfortable now. The pads are soft after I put them in the washing machine a few hundred times.
The sound really clears up with a recable and being made open. Strangely the treble is now even better.
Man I wish more people could hear this thing, but it's impossible since it's such a weird mod. Sounds like a majorly improved HD-598.
K601 and HD-598 won't be on my head much anymore. I'd say going from closed to open is like a 50% improvement with this driver. Ok, maybe not, but it sure seems like it.
I also got in the KRK KNS-6400. Now this could be one good option for a competitive closed headphone. It's soundstage is even better than the DJ100 when closed. One of the best soundstages I've heard in a closed headphone (other than the D2000).
It's got a ton of detail too. Some stuff I can only heard on the KNS-6400, but not on my K601/K702 or my DJ100. It's level of detail is like the DT-880, but more forward mids.
Strangely the KNS-6400 felt like it had a better soundstage than the 8400?! Maybe KRK made some changes. The 6400 has angled drivers!