Hi Nicola,
Although theoreticaly possible, it is still not possible to use Dante on a portB of either a xDR or other iDr because of clocking issues. At this point the Dante card is not able to receive clock through the second unit in a dual rack or expended system. I have tested this and this problem has been confirmed with AH guys. I hope you dont believe me and try it yourself in a real scenario. That way i wouldnt be the only on with this conclusion. 
Gil Parente
Design & Integration
Entertainment Arts, Inc.
iLive 176, T112
iDR48 , iDR16, iDR10
Multiple iPads
Dante
Etc..
