[Fungus]

  I just received the Alo Audio Key.  One thing that I've noticed is that it definitely can't do double duty as a DAC/amp.  The output impedance would suggest this. At max volume, it can barely provide enough loudness for a Shure 846.
 
I will be receiving the Duet tomorrow so I can test it as a pure DAC.  I do love what I'm hearing though.  Detail retrieval is exceptional.  
 
I have mixed feelings about the build quality.  The USB connector cover doesn't securely fit.  Unlike the AudioEngine D3, there is no small cover case which was a really nice touch.  It feels like Alo might have just tossed the chip in a aluminum usb key without any other work.

But isn't the audio key suppose to be a pure dac with no amp? So how is is possible to get any sound with your 846 plugged in? 

 

[musiclvr]

I have been enjoying the result of unthinkable synergy with The Key feeding the Cavalli Audio Liquid Carbon! I find the pairing to be so smooth and engaging without being veiled or too polite. I also like it because it is a true source not an amp/dac so as to be double amping as a result.

 

[Shubh]

Received my ALO Audio Key 2 weeks ago, I use Mac book pro DVD A (.mpl) -> ALO Audio The Key -> Graham Slee Voyager -> DT880 600 ohms, got to say I got my perfect progressive rock setup (for the price point), Amazingly happy. 
 
By the war The Key is available in the ALO Audio warehouse deals for only 99$ which I think is a steal.