Just got an Oppo HA-1...to use mostly as DAC; but I figure I should take advantage, by trying my first decent pair of phones.   AKG K702/65 or K712Pro?   Thanks, CD

Oh c'mon; at the very least...you own the $600 Concero. Don't tell me you can't swing $1500 speakers, lol.    Well...I'm sooooo impressed with the Concero; I'm wondering...do I dump my Mytek, for an HD??? 

  Thanks; and that's just the Office rig mate! 

WoW Mike; Bravo    That's exactly the kind of post, I was hoping for. I wondered about "longevity" as well; i.e. as you addressed...would a smaller battery unit work, but need charging more/too frequently.   I also agree, noise can be very hard to detect; and furthermore...why not start with...

^^ Thanks. I meant to include...in my OP...sorry if it's been asked and answered; but I didn't have time, to skim all 115 pages...lol.   Any thoughts, about the different models; in other words, what more amperage gets you...using it in this way?   Thanks