If you're using an Allen & Heath ME-1 personal monitor mixer system, then you need an ME-U monitor hub. Instead of creating a complicated chain of ME-1s, the ME-U allows you to easily connect 10 ME-1s to a single monitor hub. You can also daisy chain two ME-Us, allowing you to connect a total of 19 ME-1s. Out of the box, the ME-U allows you to connect using GLD dSnake or iLive ACE. The Allen & Heath ME-U Monitor Hub also gives you the option of using a MADI, Dante or EtherSound card to take a digital feed from up to 40 sources from 3rd party systems..PZA MORE SPECS