Ah I see, thanks dude. But I could presumably find a usb battery power source with a high enough voltage correct?

Ah I see, that's a very clear explanation. I see, didn't realize sensitivity is another variable to account for, i'll start reading up on that.    Would the amp then also be powered by my phone's power source? Could I make this device portable? Interesting, so a regular 3.5mm -> 3.5mm would...

Thanks @billybob_jcv! Ok, just read up on gain a little.   Yet I'm surprised my cans, with an impedance of 600 ohms, give me decent volume control at the lowest gain setting. I usually hover between 25-55% on the volume dial. Beyerdynamic also makes this model with a 250 ohm impedance, am I...

I recently purchased the 02+ODAC headphone amp to accompany my Beyerdynamic DT 880s (600ohm). But I'm a bit confused as to what some of the dials and inputs on the front of the amp indicate and how they can best be used to achieve desirable results.   As I don't have permission to post a...