Thought i might jump in and tell how the "Dragonfly 1.2" performs compared to my previous sound-experiences.
Iam not that much into audio although most of my Music-Collection is lossless.
The Combination i've used before was a Pair of Sennheiser HD595 and onboard-Soundchips.
First a Realtek xy(2008) Onboard and then the much better "Intel Series 7 onboard Soundchip" (2013)
The new onboard-soundchip believe it or not was a big up compared to the old one in soundclarity and details.
Now after purchasing the AudioQuest DragonFly 1.2 its another up on clarity and everything is nice and crisp.
Although there is something i DON'T like about DragonFly... It in my oppinion kinda goes more into the highs and not so much into the base (300hz-area), not sure if its the headphones though, but its in my oppinion too much, it pulls the vocals too much into the front, other than that its fine.
A few things i noticed while using it, that are kinda interesting!
There is some kinda fading in when it is first connect to your computer, before it is at full-volume, guess that "amping" is normal though, as it just happens when you first connect it.
Furthermore whenever you switch between song-titles that have a different Samplerate (like 44khz , 48 or 96khz) there is a short break meaning that the first few seconds while switching it kinda are lost, this just happens while switching though, if you stay withing the same samplerate nothing alike happens.
This btw didnt happen on OSX and Linux.
Apropos Linux, it works right out of the box with Ubuntu / Mint/ Arch-Linux that had a Kernelversion of 3.8 or higher without any difference in soundquality as far as i can tell.
I guess i have to get used to it, and get another pair of Headphones or play a bit around with the EQ-Settings
It works with your hifi-system as long as it has a buildin amp as mentioned.
I tested them also with a pair of AKG K140 which got an impendance of 600ohm and it still manages to power them, although nowwhere near as loud as the Sennheiser HD595.
Hope i might help out the one or another.
Cheers.