Still think these are one of the best headphones ever made. I think they're the perfect alternative to the HD-600 and Q701. Everything I don't like about the HD-600 the K601 fixes. To my ears it sounds a little more clear and not just because it has more treble. Sure it's not as warm, but there is definitely a bit less treble than the Q701.
I think the imaging on the K601 also has the Q701 and HD-600 beat. I think the only reason it's imaging is better than the Q701 is due to the flat pads. I know that sounds stupid!
The HD-600 is definitely warmer and bassier, but not a big deal for me. The weird thing is that the Q701 sounds like it has more bass than the K601, but yet the K601 seems to be slightly warmer and have fuller sounding mids. At first I thought the K601 had more bass than the Q701, but now I don't think this is true. Maybe a tad more mid-bass? Doesn't seem like it.
I do like my HD-600 now, but it's mids for me are kind of lacking. I mean they're good, but not forward or recessed, but just kind of boring. Yeah, I like slightly forward mids. I don't really care if the HD-600 has "thicker" mids.
I've noticed that this headphone sure doesn't like any DAC or Amp that's NOT neutral. It hated my old Asgard and HRT MSII. Maybe those measure ruler flat, but they didn't sound that way. Maybe the Asgard just didn't have enough power for the K601. The HRT is ok with the K601, but I think the HRT is too forward sounding for the K601. The ODAC seems to love the K601. There's no really harsh peaks or anything with this setup now. If there is, it's really awful recordings. Even then it's not that bad.
BTW my pair is 19714 and made in Austria. I paid around $200 for it about 2 years ago I think. At one point I put it up for sale (stupidly) at such a ridiculously low price and nobody wanted it. How sad..that goes to show you how under-appreciated the K601 is. I actually think it's better than the K501 and K400. The K400 doesn't have enough bass for me. The K501 seems ok in that area.
I also think the K601 is a good alternative for those that require less treble than the Q701 and possibly a more balanced sound. The mids on the Q701 do seem a bit more forward sometimes. At least the upper mids. I actually think the K601 has more forward mids than the K702 though. The mids on the old K702 I had were quite thin/lean. Same setup and everything.
The K601 doesn't seem as clear or detailed as the Q701 though, but sometimes I just don't care.
Oh yeah, I think sometimes think the K601 must have some lower treble peak. With the ODAC it seems to rarely show up for me. At least I think it's in the lower treble area.
So anyone know for sure the K601 is discontinued? I don't think it is. Hope not.
I have to mention that the K601 gets my vote for possibly the #1 gaming headphone. Q701 is just as good if not better, but just a little bit different sounding. When gaming you can definitely notice the reduced bass on the K601 compared to the Q701. It's VERY noticeable in Fallout 3.