I was in a similar spot, where I didn't want to make the purchase of the HE-6 blind and not knowing what to pair it with. And specs aren't going to necessarily tell you if the presentation the pairing returns is for you. One advantage you have though, is you're bringing the cans in and that's a plus! Now you can go around and listen to potential amps with them and seek; compare. My own breakthrough came when I received a loaner pair to audition.
9/3/15 at 1:49pm