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I've got the old one (pre red & black)
I think it's basically the black one. It seems the red has higher output.
dangeek-
I have the black. My work computer soundcard is horrid. Very, very noisy, full of static and a low noise buzz. I leave it permanently plugged into my computer now so I don't need one that small in all honesty - but when I bought it I had a laptop.
My Shure SE425's are difficult to drive. To have them at their best they need amplification. The DAC is nice due to how much noise there is coming from my computer. Just an added bonus really.
I don't use anyone else's devices to listen to music, only my own, so to have my devices them configured for use with the Dragonfly is no big deal. I don't use it with my phone either - I used to, but I normally only use my phone for an hour at a time max, so I don't care enough to carry the Dragonfly and a lightning>USB connector around with me. Oh - and to use my computer without the Dragonfly, my Windows volume level is set to 60/100. With the Dragonfly it's 4/100. It's a very powerful little thing...
JB
Also at @dangeek
..did you guys have the red or black one?
Was looking at them repeatedly (did not have the opportunity to try them unfortunately), but small size and good reviews made me think..
In the end I went for something different as the Dragonfly's USB-in was just not usefol for me - I like to use the amp with both lightning and old-style iPhones as well as other peoples' phones / players that are 3.5mm jack so can't be arsed to get adapters for everything.
I guess the thing is I don't need the DAC part really as while I also listen to music from my laptop the built in soundcard seems to be pretty decent already.
If you mainly need amplification and like to have standard 3.5mm in/out then Dragonfly is not that well suited, and I think it's quite expensive as well. Can't imagine that thing being much of an amp in the first place, not having any battery itself?