8400 are very promising! ... The 6400 aren't that fantastic though not bad. Put some impressions in the 8400-thread. Feel welcome to comment!
Was nice to get a chance to compare them side by side. From the measurements at Innerfidelity, the 6400 indeed seemed to be the better headphone and I almost ordered them. Thank goodness I didn't since this was not the case at all however based on today's experience.
Just comes down to which one is better for your favorite music It seems most now prefer the 8400, but not me!
I still do think any who listen to metal, classical or acoustic music should be better with the 8400.
Felt the 6400 had the edge when it came to vocals, but again, I use these just for fun and not as a studio monitor.
The 6400 also did a little bit better for gaming, but highly unlikely anyone would buy them for that!
I think in my reviews I always said that for studio use, I'd always pick the 8400. It IS technically better.
As I've said before in another post, it's like comparing the K501 vs the K702, but the differences are even minor. Some will pick the K702 and others the K501.
I guess for those on a budget and can't fork over the extra $50, the 6400 isn't a huge drop in sound quality. At least not for me.
The second main reason overall I prefer the 6400 is that it's mids sounded far more forward. I love my forward sounding mids, even if makes it less neutral!
The mids on the 8400 were a tad relaxed for me. Not recessed or not forward sounding. One review I read called them "scooped out" and this makes no sense to me!
Edited by tdockweiler - 9/12/11 at 9:52am