Be careful when using adapters. If the amp shares a common ground then you will be fine but if the amp does not you will need a true balanced cable to run it off of speaker taps. I took the trrs balanced cable cut off the end and terminated it in speaker plugs and works great. Not the best looking but works. I'll probably commission someone for a cable in the future.
That is very true, but the Emotiva Mini-X has common ground. I use a single ended adapter on it myself.
There are two ways to be safe about adapters. One is to make the adapter cable balanced, so that R- and L- are separate in the cable. You can't have a TRS jack anywhere on the cable or in the adapter, because TRS joins R- and L- into ground. If you have a balanced 4 pin XLR on the headphone (or a TRRS), you can get an XLR (or TRRS) to speaker taps adapter. Then you can hook it up to any amp at all.
The other way to be safe is to use three wires instead of 4 in your TRS to speaker taps adapter. Meaning that you have a wire for R+, one for L+, and a third for ground. This third wire connects the sleeve of the TRS jack to either one of the negative terminals on the amp. It makes no difference which. This sounds exactly the same as having both negative terminals connected if your amp is single ended. If your amp is balanced, it will probably sound weird but it shouldn't fry anything. This is the configuration I use.
Anyway, all of this is kind of moot because the Emotiva Mini-X has common ground.