Acix, I sincerely hope you are correct :) But I do have my doubts. As I said in my first post, I had a used pair of K701s couple of days before my current new pair. They sound the same to me. But if I hear any changes with the sound quality over time, I will of course post about it.
tdockweiler, nice to hear your thoughts on this, and we seem to agree almost with everything :) I have never heard the DT-880, but they sure seem to be interesting headphones. I hope someday I will hear them.
colmustard, I just listened to in the aeroplane over the sea, and you are absolutely right :) K701s sound amazing with well recorded acoustic guitar. It is a joy listening to tracks like King of Carrot Flowers Part 1, Communist daughter and Oh Comedy through the K701. I think it is better suited for that stuff than the HD650s.
But as we both know, that album has more going on than just acoustic guitar, and with those parts, K701 just does not deliver. And the HD650 does not do much better either. So, the overall performance with this album, which is one of favorite albums of all time, leaves me unsatisfied, both cans. Actually, I think with this album my HD25 delivers the most enjoyable performance, from my current line up. I hope the MS-2 changes this situation.
rhythmdevils, I am sure there is a lot of truth behind those words. As I said in my first post, bass performance is were an amp can deliver some clearly noticeable results. And the biggest difference, in my opinion, with my Nuforce HDP and Benchmark DAC1 is in the bass performance. DAC1 has more control, but it still is nothing special. I did have a dedicated hybrid tube amp with the HD650 before, but DAC1 delivered better results for my taste (and most importantly better bass control).
I think that when my budget allows me to go for more expensive stuff, I will go for the HD800, paired with DAC1. Rather than to get an expensive amp for my HD650. As we all know, when Sennheiser first introduced the HD800 and let reviewers and critics listen to it, Sennheiser used DAC1 as the amp. I believe Sennheiser would have used another amp, if they had felt that DAC1 did not deliver the full potential of the HD800.
Of course this is just my feeling, as I said, I have never dared to listen to a HD800 :)
while i'm not a fan of the HD650, i thought the pairing with the DAC1 was excellent. the K70x/DAC1 combo, meh...too thin and bright. rolling K601 pads fleshes out the K70x a bit and tames the treble, but they still need warmer upstream components.