Might be. I'll try the Mojo 2 with my laptop through USB, see if that makes any difference.

I have the same experience that you have described under "Edit". If I use USB connection, the sound is much more analytical, and can get quite fatiguing very quickly. Don't forget, that my source is a gaming PC, so the superior results of using optical connection might come from the fact that...

Yes, for me optical provided much better results than using direct USB connection. Buying a USB galvanic isolator, or a dedicated DDC would be pretty much pointless and irresponsible, without knowing if it would change the sound (for the better) on my system. I wouldn't get a streamer either...

How come is it worse? Doesn't optical just sends the signal, and the conversion actually happens in the DAC/AMP (in this case Mojo 2)?

Got ear fatigue with the iPowerX + USB combo. Did some more testing, and by far I got the best results, when I used the optical cable, and the samsung mobile charger. Strange, but i'll take it, the Mojo 2 sounds really organic and 3D like with this setup. :)

Using the iPowerX + USB combo seems to provide good, audibly clean result, which is strange, knowing the Mojo 2 can show some noise when connected directly to PC according to measurements. I'll keep on using it like this, and see if I'll get any ear fatigue after long listening sessions.

Hi Guys! My source is a gaming PC, I have an optical cable (nothing extraordinary, it is a Hama Fibre Optical), and an iPower X. Which cable should I use for most optimal listening experience with the Mojo 2? Optical or USB? Should I use a Samsung phone charger (5v/2a) or the iPower X (5v/3a)...