Many asked how it would be possible to connect an EMT with XLR (balanced) connectors to a RCA (unbalanced)-equipped pre. This is how you can do it, the 'b' signal output of the XLR goes to the RCA 'hot' (central) pin, whilst 'a'+ground are linked and connected to the RCA 'shield'

(Thanks to dipl. Ing. Dusch for the scheme)