Just some findings while getting my unit running.
The settings recommendations says:
However, when playing very high bitrate (~110mbps) content, I was seeing stuttering and buffering. Setting the cache memory size to a minimum of 192MB fixed the problem for me.
Also, for anyone wanting to rig up a custom power supply for the AMB6+, the DC barrel jack is an uncommon 4.0mm x 1.7mm tuning fork connector. Helpful if you want to pick up a USB-PD to 12V barrel adapter.