Try reinstalling the latest firmware again as @zenon recommends, if not maybe the USB cable might be bad but still unlikely. Finally, try contacting Topping describing the problem because it might be a bad unit. Also, what are the first 4 numbers of the serial number on your D10? As you must...
You're on the latest firmware and driver. However that driver is meant for Windows 7 and Windows 8 which don't have support for UAC2 out of the box. So, maybe you may wanna try uninstalling the driver from Topping and use the one included on Windows 10.
Have you updated your firmware?
http://en.tpdz.net/wdzn_detail/newsId=84.html
Also, if you're using Windows 10 I suggest not to install the Topping drivers, but use the drivers that already come in Windows. :)
"Measured output voltage was 2.113 volts (RMS) on one channel and 2.108 on the other so very excellent (0.021 dB difference). Response is essentially ruler flat to 20 kHz."
I guess he was trying to say 1.5 Vrms vs 2.1 Vrms. Also you can check that on the new analyzer RMS level shows the 2.1...
Take a look at this...
https://reference-audio-analyzer.pro/en/report/amp/e-mu-0204-usb.php
Checked it out quickly and did notice it's an amplifier too, impedance seems high at 23.4 ohms and its amp section seems low powered, but as a DAC doesn't seem bad. If you connect headphones directly...
Long story short, RCA cables are better than 3.5 mm and will most surely measure a bit better (between cables of comprable quality), however you won't hear a difference so simply use the most accessible to you. Just don't do long runs as they're both unbalanced! ;)
From what I've investigated, distortions aren't that audible until above 1% for THD and in certain cases not even until above 20% for mid-bass at 280 Hz and lower, not to mention 20 and 40 Hz:
https://www.axiomaudio.com/blog/distortion
And 0.5% of Transient Intermodulation Distortion seems to...
However I don't understand why when using the USB-C audio adapter it makes no mention of doing the MQA Core decoding, as the Essential Phone is an MQA capable device of some sorts. But with the DFR and KTB it mentions as if the complete decoding was done. It's not like something very important...
From what I understand software decoding only manages to unfold up to 96 kHz. After that test I tried a 352.8 kHz MQA stream on Tidal and showed it was being unfolded on both, the Khadas Tone Board and the AudioQuest DragonFly Red. The weird thing is that when using the USB-C audio adapter it...
Using Tidal with the Khadas Tone Board on my Essential Phone today I got the following surprise...
It seems to be unfolding MQA on the HD Audio Accessory, in this case the Khadas Tone Board (or at least that's what the system is informing).
Here I try with the USB-C audio adapter included with...
Check the instrucion manual...
https://www.jdslabs.com/pdf/instructions-atom-amp.pdf
And try this from troubleshooting:
Amplier does not turn off
Cause: On rare occasion, mechanical relays can stick
Solution: Tap or knock top of enclosure with moderate force to disengage
The idea comes from the HE 60 that was sold at the beginning of the 2000s, which was a good electrostatic but the energizer however was the weakest link. So hopefully a better energizer, some better electrostatic drivers (at least same or better than the HE 60) and a price under $1000 is still...