From their website:
"every unit finished the parts assemble , must had the full test by the technician , then build by another technician .
There are 300 hours burn in time after building, during the burn in time, every unit must had two times test in every day .
Finally , the QC technician had the final test and audition before package and shipping.
The complex process in the building , just for keep every units had the highest quality"
And also
"Audio-gd products had design and test based on the AP SYS-2722 (The top-drawer professional equipment in world)"
I don't know in which drawer the AP was when they tested this one, but it was not on the test bench, for sure.
That may be a broken unit, though ?
They claim "SNR >120dB"
and
"THD <0.0005% (20Hz-20KHz, Non-Weight)"
(-106dB)
But as we see here, 20Hz-20kHz unweighted... with this kind of "filter", seriously ?
I also wonder what they do with the DSP.
Given the linearity, maybe they expand at low level to push noise down ?