I used
DAC measurements:
I have measured the Moon Drop Dawn Pro with Audio Precision APx555 recently and I would like to share with you. I bought the Dawn Pro myself. Here's the specifications from the manufacture. Just in case. The Dawn Pro is a small and light DAC/Headphone AMP, Only 42mm * 22.45mm * 12.39mm and...
www.audiosciencereview.com
Manufacturer specs:
moondroplab.com
notably:
(Hmm, why would they only measure the balanced output to 2 Vrms?)
In any case, you can see that the thing is utterly unimpressed by 300 ohm cans, and seemingly entirely voltage-limited.
If you still need more data, I would look at some other competent dual CS43131 dongle DAC implementations.
That's a more traditional DAC-amp that really still contains a separate DAC portion and amp even with variable gain, plus MFI certification. I'd still consider it quite expensive for what it does and can't see a good reason to spend that much on a dongle DAC.