I'm thinking of ordering a ZMF Atmos C cable, which offers many different termination styles, but I had a question about using it with the iFi Nano iDSD BL amp/DAC (link) Front inputs: 2 x 1/8" / 3.5 mm headphone outputs, compatible with balanced wiring (one direct and one with integrated iFi...

This will only take a sec!   I'm looking into headphone amps, but don't know whether I need a desktop amp or a portable. I guess what I'm asking is: are all portable amps battery-driven, and wouldn't that be a pain recharging them all the time? As a video editor who also does a fair amount...