Stereo-to-mono downmixing RCA Cable

A good point, I should have been more specific. There are other inputs, it's just none of them are stereo,
Right... so bottom line is you are simply over thinking this. You don't need any special cable, the speaker can't reproduce a stereo image anyway but it will happily mix the L and R signals of a stereo source to mono.

It appears there are 3 ways to accomplish this..
1. Connect the mixers main L and R outputs to the available inputs with common XLR or 1/4" cables.
2. Connect the AUX output of the mixer to a speaker input with a 1/4" cable.
3. Connect the MON outputs of the mixer to the AUX input on the spaker with an RCA to 1/8" cable.

The 1st two options are more robust and should be noise free if you use balanced cables, the unbalanced RCA connection could pickup some noise if the cable is more than a few feet long. All will produce the same audio result.
 
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Basically all the magical resistor yada yada.
Has already been done by the manufacture.

Either use the 1/8 inch summing input.
Or use both channel inputs one for L and one for R

Or just monitor a stereo signal with a everyday stereo to practice too.