Unclean means ear piercing sharpness and it gives fatigue also headache. Latest version Updated and I tried it with multiple devices but the issue still there. Also tried 1.0 mode , installed ua line drivers but nothing worked for me.What do you mean my unclean output? I had an issue with my UA3 producing lots of static on a Raspberry Pi, placing the device in UAC 1.0 mode resolved it. Try holding down the multifunction (middle) button while plugging it in. The light will change to red confirming the mode.
Outside of that, you can try updating the firmware to the latest version and fiddling with the settings in the Eddict Player app on your android phone.
I think it's a problem with This model UA3 because sometimes it works fine and the sound was amazing ,clear and non fatiguing.
Shanling should fix this issue in next firmware update.