For this application, I think you can get by with a simple XLR Y connector to combine two channels of a stereo mix into one. An example is the Hosa YXF-119 Y Cable, XLR3M to Dual XLR3F for about $8.
I know there are purists out there who cringe when such a suggestion is made. To be suitable for all possible situations, a combiner/splitter should have some type of isolation. For passive devices, resistors or transformers are used to achieve this isolation. Most of these devices are designed for use with mic-level signals. If you use a transformer like this with a line-level signal (such as a Mix output) you may saturate the transformer.
I have attached a diagram of a resistor-based device. This particular one was designed for A Shure microphone with 470-ohm impedance. The QU Mix outs are rated at 75 ohms. You should use 75-ohm precision resistors for best results, but I’d guess that you could get by with standard 100-ohm resistors for what you want to do. This, of course assumes that you know how to do this sort of thing.
If you don’t, then just search the web for line-level balanced (XLR) combiner. The Rolls MS20C sell for $44. Others are Whirlwind-IMCOML ($100-$137), Galaxy ($30), Audio Technica AT8681 ($53-$77). If you prefer a professional active device, they are out there for $600. You may as well buy a small two-input mixer!
Just use the Y connector – it should work fine. But wait for the naysayers to respond…..
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