I´m sitting here listening to my HD650s which arrived today (for the second time), which are the latest version with the silver screen. I also got my LT1364 today, the reason why this is my second listening session. First time was with the OPA2107, this second time with the all new LT1364. The tubes I have are the popular Sylvania Gold 408As, which should be well burnt in.
Well I´m not good at all putting words to what I´m hearing, but I´ll give it a shot, also this is from memory because I had about a 2h break between the tests, also there could be differences in volume which also could explain certain differences.
I think the sound has gotten generally clearer. I feel that this is because the high bass/low mids seems a bit tuned down. Though the bass now seems as it extends deeper. So the lower regions seem overall clearer/cleaner than before. Mids are a bit harder to really define and put into words what has changed, I think that there are differences, but can´t really point out what they are, same goes for the highs, maybe a tad more "shimmer" from cymbals and those kinds of instruments. Soundstaging seems a little more defined and it´s easier to point out where the sounds are coming from.
Overall there are small changes, which I think make my 'phones sound more open and natural.
