well wired in and it is working.
nothing gets warm to touch or anything. Everything is grounded to chassis including the the wall wart, PCB grounds are tied together. The input trigger voltage comes from the desk.
The desk had a module in it which was a speaker select module but when they moved the desk from the old location to the new location, the original install techs could not figure out how to wire it and may have hacked off some critical things. I have no schematics of that section so I don't know for sure. It has relays in a card cage that is seperate and the relays are supposed to switch on and off when you hit the buttons on the speaker select module. for a few years off and on several other techs could't figure it out. At one point the owner was asked to hit up the designer who did all the desk mods and that never happened. The owner has no idea and would go, it just worked. Famous last words I say. Through testing I was able to get 24V from the desk down to 1 of 4 eco pins depending on which speaker was selected(mains, mids, small, smallest), so used that as my input trigger. So far it is working and nothing has blown up or gets hot. the selects with new card works. Ha za Ha za. thanks for all the insight and help guys. You are a true delight...