Hi Mitch (Keith from Emotiva here) - got your question but your e-mail address got lost from the forward.
Anyway, to run 4 X-Ref 12's from one output, you can either use a four-way splitter or daisy chain them (using the balanced in and out on each). Of course the pre/pro is going to see them all as a single sub. Since the X-Ref 12's have individual EQ and level controls, you can control the balance between them by using the individual controls (you could even, for example, set one to make more lower frequencies and another to make more higher frequencies, or do even more cool customizing since each has a dual band parametric EQ. You could do some cool stuff to help control room resonances that way). Then, when you do EQ or run auto-eq on the pre/pro it will EQ the entire set as a single sub and so EQ the sum total to be correct for the room.
Anyway, to run 4 X-Ref 12's from one output, you can either use a four-way splitter or daisy chain them (using the balanced in and out on each). Of course the pre/pro is going to see them all as a single sub. Since the X-Ref 12's have individual EQ and level controls, you can control the balance between them by using the individual controls (you could even, for example, set one to make more lower frequencies and another to make more higher frequencies, or do even more cool customizing since each has a dual band parametric EQ. You could do some cool stuff to help control room resonances that way). Then, when you do EQ or run auto-eq on the pre/pro it will EQ the entire set as a single sub and so EQ the sum total to be correct for the room.