Oh that's really sad. I have my Fiio K9 AKM for 2 month now. I'm using it almost every day with usb. High gain for an HD 660S2 You should receive a new one if you return it.

Maybe the DAC died, if the other inputs working RCA? In any case contact your seller or Fiio for guarantee.

Did you use the power switch on the back, to shut it off completely? If not then try it after 5 min again.

Sorry i can't speak for the rme amp. I have a Fiio K9 AKM. And i wanted just data for to config eq in Windows. Yesterday i just used a profile for sound id sonarworks. Sounded good. I can't give a good impression, because my ears are not good.

Can you me send the link, please.

Aliexpress is the best for you now i think https://de.aliexpress.com/item/1005006340619022.html?gatewayAdapt=glo2deu Ah sorry i didn't see the Pro... I think the pro am non pro are almost identical. Or there are a big difference?

Normally we don't touch the cable. So it will be not a big problem.

Openheart Kabel XLR 4,4mm Sennheiser HD580 HD600 HD650 hd545 hd565 hd535 HD660S HD6XX https://a.aliexpress.com/_Ey9IejL

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