Try it. I was surprised to find that it actually boosts the soundstage a bit.
The way I have it hooked up is: I have a dual RCA to 3.5mm cord going from the M-stage to the mixamp's Y-splitter. I have the Y-splitter then go into the mixamps HP jack. I had to do it like this because I have the FAT monoprice premium cable that doesn't fit in the mixamp 5.8's 3.5mm jack.