MANY MANY THANKS !When I wrote 0 Ohm I mean no reading.
I've rewired everything following AMB schema, completed the setup and tried to connect it to a source, and....
It works, more or less... 
The E12 board always switch on/off every ~4 seconds, I only ear music for half a second.
I've followed the E12 setup successfully, Between G2 and pin 6 of U1 I've only 0.4 mV, tried to lower that by adjusting VR1 without success, whatever the direction I turn the value doesn't change.
Could it be the reason ?