Hi guys. I think I mentioned earlier in the thread that I was working on a big review of a number of USB DACs, microStreamer included:
- Audioengine D3
- Cambridge Audio DACmagic XS
- HRT microStreamer
- CEntrance DACport
- AudioQuest DragonFly
- Meridian Explorer
- Arcam rPAC (not actually reviewed here, but I included it in my comparisons)
Anyway, review's out; hope you guys find it interesting:
http://www.macworld.com/article/2089224/usb-dac-review-six-compact-components-for-upgrading-your-computer-s-audio.html
Great review, I'd really like to compare my microStreamer to the DragonFly!
After a month and a half of use, I feel that I can give share some impressions of the microStreamer at least. I've been using it with my AKG K550, and also with my PA2V2 amp connected to the line out from now and then. Being fairly new to HiFi and headphones, I haven’t got very many references, and coming from a pair of AKG K518, I might be a bit of a bass head.

And bass punch is something I actually do miss in the K550/mS combo. The bass sure does go deep with great control, but it's not very punchy. In the mid and high frequency regions, I've not got very much to compare to, but to me the sound stage is very big. Every instrument is easily distinguishable. As I said, I have not very much to compare to, therefore I dare not make a verdict on the highs.

The combo do benefit from some crossfeed. With the vocals placed in the center, it’s easy to hear the sound being feed from two separate channels. Some crossfeed brings the vocals together.
Adding the PA2V2 to drive the headphones, to me, makes the sound more likeable. It adds the punch to the lower frequencies that I miss and makes it more “fun”, maybe adding some more body to the sound. There might be slightly more noise in the background, but nothing that I notice without really trying, it might simply be my imagination.
I don’t know if the perceived improvement is due to coloration, it feels like the PA2V2 has more control of the elements in the lower frequencies.
To conclude, I think the sound of the K550 and microStreamer might be slightly clinical and boring, while the PA2V2 ads some musicality and fun to the sound. This is absolutely the best sounding setup I’ve ever heard, headphones or a big stereo rig. In a good recording, nothing is hidden, everything is clearly distinguishable, punchy and simply awesome.