Well my NX2 arrived today and it sounds great. I am just streaming using an old Windows phone and using the Audio connection now until my mini to micro USB OTG cable arrives but I can tell the difference. This is my first headphone amp so I can't compare. I have v-moda m-80s at the moment. But...

I would be interested to hear if the NX2 is better shielded against interference of your cell phone. Like if they are put back to back.  Also it looks like for Android, I'd have to find a short micro USB to mini USB cable. 

I would be interested if there the NX2 is better shielded against interference of your cell phone. Like if they are put back to back.