thanks for your response guys.
Dennis, I am asking about plugging the two cables that are currently plugged into the main outs and plug them into the Tyros speaker outs on each end of the keyboard.
Don, that is what I am doing now only opposite with the Logitech plugged into the mains and the mixer plugged into the head phone.
I just don't like the wires and adapters sticking out of the head phone jack as I am afraid of hitting it and breaking something off.
Bill