Q: 
Our customer uses 2 iLive systems with 2 MixRacks and 2 consoles in FOH + Monitor mode.
They are going to use an ME-1 system. So, is it possible to connect this system with ME-1?
If yes - then how?

A:
If they are using 2 iLives in FOH<>MONS then it is likely they are using an M-ACE card in each MixRack to share signals:
On the master console, take the ACE link2 output from the Port_B module and connect to the first ME-1 (or to the standard input card on the ME-U hub called the 'ME-D' card). 

In this case, the ME's will get the same signals being sent from Master to slave (probably Mic Pre splits / MixRack inputs). 

Alternatively, take the 2nd ACE link out of the Slave Console and choose channel direct outs to send to the ME
(or maybe some subgroups FX, Auxes, etc). 

NB. ACE channel #21 >>> ME channel #1,
      ACE channel #22 >>> ME channel #2 and so on.
      so think about the original signals!

If they are not using ACE (maybe Dante etc) then they will have to use an ME-U and get an appropriate digital audio card to allow input to the box.

If it’s a modular iLive system then either the Multidigital out card or the MMO card will provide an Aviom feed which also works (in 16ch mode) directly with the ME-1 units.

N.B. to get iLive channel names displayed on ME-1 units (only via ME-U) might require a firmware update of each ME-1.