US Naval Academy Washington Professional
This custom stagebox was designed by  Ritchie Smith  of the  United States Naval Academy Band  and  Colin Smith  of  Washington Professional  in Wheaton MD.
It accomplishes a two-way, transformer isolated split with ground lifts via W4 MASS connectors located on the right hand end (not shown).
In addition, this unit was completed with a 40 X 0, 12' fanout for the monitor section along with a 56 channel MASS to MASS extension cable with a 40 X 16, 10' fanout for FOH.       
All 40 inputs and 16 return lines are duplicated and accessible through the W1 multipins located on the left end of the stagebox which allow connection of input and return subsnakes.