I'm pretty sure it does. No particularly anything special IMO from what I've read.
My finding is that I do not consider ASG-2 as something we can use across all genera with great success however with the right type of music it really shines.
I can say the same thing for a lot of headphone reviews here. A single song won't help, soundstage and layering are holistic of frequency, detail actually does convey information, but the location of detail, lower mids, upper highs, etc, would make it even more useful ;)
I suggest the Leckerton UHA6 MKII or Tralucent T1 amp. You'd be hard pressed to beat those. I prefer both by a nice margin over the O2 amp. Not sure how the C431, C5, or ibasso T1 amps would fair but I honestly don't see them comparing. I preferred the Leckerton and Tralucent over the DX100s internal amp section which is supposedly better than their flagship amp section.
Lee, would you consider the T1 a colder amplifier? What I mean is the opposite direction of warm - as I have the 8A and I don't want to pile warm on top of warm - I'm thinking LOD out of a Classic...
EDIT: Should probably done that by PM - sorry folks.