I wonder how many people skip out on the Micro due to it's size. I can't wait until I get some people commenting about how my headphones are underamped if I don't like them Based on how small it is, many people might wrongly assume it's a portable! This thing is tiny! Half the size of the E9 unless you add in the power brick.
This Micro amp seems even more powerful than my E9 and Asgard by far. If I use High Gain (Medium is enough) for my HD-650, I could probably blow up my headphones if I wanted.
It does kind of bring forward the upper mids a tad, but not too badly. It makes most music a little more fun to listen to. I don't think say a W1000X or an ATH-AD2000 would be a good match for them, but maybe. I bet the Denon D2000/D7000 would sound great on these.
Yesterday I was comparing the mids on my K702, HD-650 and K601 with female vocals. It was a bit confusing. On my HD-650 female vocals sound a bit more forward than the others, which I like. This seems to go against what I heard previously before I had the new cable and amp. I'm not complaining. With my setup my silver screened HD-650 isn't too laid back or boring. Just about right. I still don't find it to be a detail monster, but I don't want that. Still has enough detail for me. My HD-650 sometimes can't even pick up recording hiss on any amp. That could be a positive or negative.
K702 was strange because often vocals would feel quite distant and other times they were more forward than before and more in your face (depending on the recording). Perhaps the K702 is just more accurate to how it was recorded. Who knows. I imagine this is true.
The K601 mids are somewhat more forward sounding to me than the K702 with nearly all music and never randomly sound distant like on the K702. I think maybe it's not as accurate as the K702. Perhaps the K702 is more true to the source and how it was recorded. It's just strange.
My K702 is nice now, but it's treble is an issue. I've been burning it in non-stop to see if it gets tamed. With brightly recorded Japanese pop music it can sound a bit un-natural on the K702 at times.
After a few hours of comparing them I prefer the HD-650 and K601 for 90% of my music. Still prefer the K702 for specific genres, but nothing wrong with that. I love soundtracks and ambient music with the K702. It's also my gaming and movie headphone. I HATE the HD-650 for gaming and movies (HD-600 is ok though). It'd be nice to have a headphone for everything, but that's nearly impossible. The closest I've come to a do everything headphone has been the HD-600 and HD-598. K601 is fairly close to that also.