FWIW, here's what I did based on koiloco's idea.
Initially, I installed the mini xlr and TRS jacks on the face plate of the Emotiva a-100.
I heard a hum from my Mini a-100 that sounds like a ground loop or 60 cycles per second hum so I added resistors following robrob's schematic a couple of weeks later and the hum disappeared (see Step Two, below). The Emotiva Mini a-100 performs very well, for me, and sounds good. For the price, you can't go...