iPhone (or iPad), typically running ROON ARC with Audeze LCDi4 EQ preset.
Luxury & Precision W4 DAC/AMP
Hart Audio Cable - silver braided, using 4.4mm balanced tip.
Audeze LCDi4 Planar “IEM”
If that is too bulky, or I don’t want to carry around flagship IEMs, may substitute LCDi3 with Cipher cable for the DAC and IEMs
I usually use iPad 6th gen iPad mini as source, but can’t show Roon ARC well from inside my home net. the iPad has plenty of battery. Occasionally I use a powered portable dock for extended listening. If so, it’s usually connected to a large battery rather than wall power, as I find the Audeze LCDi3 and 4 sensitive to hum if connected to an AC power source. I did not have this issue with the plastic shelled iSINE 20.
Quick & Dirty rig would plug an iFi Go-Link into iPhone, and connect to Dunu Titan S or TruthEar Zero Red IEMs.
Background on photo is standard 8.5 x 11 paper, for scale.