That is awesome, thanks for the link.
The HD 598s are, IMO, an unsung hero of headphone value; it's not so much the DragonFly, but the FiiO E11 in the chain that really makes them sing. I find the DF on its own a little lifeless without an external amp. As always, YMMV.
I was listening to this setup yesterday and noting that, in some ways, I prefer this playback chain to my HD 650s with my desktop rig (I am still getting used to the 650s and am struggling with the veil).
What amp is that?
Dooo eeeet...its been around for years and is still very expensive (USD$700) but OMG...the sound...
from people 'in the know' even new portable amps nowadays cant beat it. IT IS THE ULTIMATE AMP
iPhone 4s 64gb ---> VentureCraft GO-DAP DD Limited 12V (MUSES02) ---> Chord Hugo ---> Wagnus Bialbero Epsilon S ---> Whiplash TWau Reference ---> Hidition NT6 Pro
Now all I need are some shorter / better cables & I'm all set