From the Headfonia.com review linked above:
The EX5 features a basic, single-color display that shows information about the active input type, sample rate, and amplifier mode. There is a separate LED on the left side of the display that shows information about the MQA playback. Apart from that, we have two outputs on the front. Those are the 6.3mm headphone out and the balanced XLR 4-pin out.
Apart from those, the rest of the inputs and outputs are located at the back of the device. We have balanced 3-pin XLR and unbalanced RCA outputs.
So those outputs in the back are balanced 3-pin XLR and unbalanced RCA outputs, which will work with your Audioengine A5+ setup and future studio monitors that have xlr inputs, like a Kali Audio LP-6 set.