Ok, here is a simple test you can do:
If the console uses a wall wart power supply, do not plug it in. Plug 4 low wattage lights into the console (60w is fine). Using a TESTED (pin 1-1, 2-2, 3-3) mic cable, plug the
dimmer and the console together. If the console powers up, see if it can control the dimmer. (Make sure that all of the dip switches are set to off for the address or check the menu to make sure that the dimmer is set to channels 1-4.) If it can control the dimmer, power down the dimmer and do the same with the other dimmer.
Most of the NSI line and quite a few others put voltage down pin 1 so that it would power small consoles. I think that the current is only about 1A max so it wouldn't work with larger consoles.
Hook the two dimmers and the console together. When you operate channels 1-4, both dimmers should respond (since you set them that way).
If the console does not come on when you power up the dimmer, either the dimmer doesn't support this or the low voltage regulator in the dimmer is bad. If neither dimmer powers the console, then it must be powered via an external power supply.
Also, don't get phantom power (audio) and power down a separate pin confused. They are two separate things.