The impedence of them is going to cause you issues I think DC's are 150ohms for the cans and 50 for the mic or it could be the other way round.
You will have to have a look through the tech specs of the intercom to see if they are within the range it can operate with.
I ain't very wiggly amp savy though but I would stay clear of anything which isn't the same as what ever the tech sheets of DC say.