These must be 3 phase mixers (electrically there are two choices, single and three phase) Three phase cables typically have 4 wires, black, white, red and green (green is ground of course) To reverse the rotation of your mixers you would have to swap two of the three colors, and it doesn't matter which two of the three you choose, DO NOT SWAP THE GREEN, LEAVE IT ALONE. for example, just change red and black wires where it they connect to the plug. Of course turn off the power, unplug the the mixer, and usually you can take the plug apart and reverse the wires. If your units are hardwired you should call an electrician in to do it, it will only take a couple of minutes.
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