First off, I realise that none of this system is ideal. When the strange Covid conditions are over, we will be sorting it out properly: this is very much a "for now" solution.
My church has an existing sound system, with three wireless microphones, leading into a T-loop system and ultimately a Denon DN-300R recorder. The recorder's outputs are the only ones we can easily access. We have also purchased some additional microphones (the existing ones are really good only for speech, not for the organ/choir music we have) and the Behringer Xenyx X2222USB mixer. (Ultimately, all this audio ends up in our live-stream: we have no speakers in the building.)
My question is how to get the audio signal from the existing system into the mixer. The recorder's outputs are (a) a phones jack, (b) an RCA pair, (c) an XLR pair. (The audio recorder only receives mono inputs, so we only need one channel.)
The mixer can have three types of input: mic-level XLR; line-level jack (balanced or unbalanced); line-level RCA.
What is the best way of getting the audio from the existing system into the mixer?
I'm not remotely an expert, but the system I've come up with is getting an female XLR to male balanced TRS jack cable to go from the recorder's output to one of the line-level inputs. But is there a better way?