mono monitoring

I want to be able to monitor  in mono via a single Avantone powered mixcube.
 
I think I am in true mono but I'd like to verify this. I did the following:
 
1.  come out of one side of interface (e.g., Left) line in to mixcube
2. engage mono in Sonar's master channel
3.  pan Sonar's master channel hard to same side fed to cube
 
Is this correct?
 
 
thanks!
 
Kawika