Problem solved for me, it's normal when activating the DAC on XD 05 plus. That other weird sounds I experienced, is only appears when phone call comes into my phone. And it's normal too.In your case I presume its a temporary switching sound which even my Fiio Q5s does when switching input, but in my XD-05 plus its more a **continuous** clicky poppy which occur s when using USB input in medium+ gain, boost on and volume 1 AM+ mark.
Guys, if anyone of you have the XD-05 plus can you please check if you see similar issues using my settings, I am using HD-6xx, want to see if it is my issue only or its across the board.
I had many clicky poppy sounds on my sensitive iem before (btw , although the XD 05 was in normal conditions, it will make some click sounds because of my sensitive iem) , and I try to tighten the opamp into the PCB by pushing it a lil bit, and the clicky sound is decreased. Maybe your opamp is a lil bit out from the PCB just like my problem.
If the problem still appear , I don't know. My device is normal paired with R70X on hi gain and boost mode. All gain mode is normal too. With your settings is normal too , no clicky sound. Have u tried with other headphone?
Sorry my bad English
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