Somebody already asked about the ADA8000 but my concern here is could I rig the passive device in it and then link it to my Apogee through optical in order to monitor myself ?
Secondly, I know that the outputs are XLR connections, so then could I use this type of cables with only the + attached to the plates ?
I think that would work. As always, my advice would be to try a 1x1 junction with the hardware you are thinking of using, and work up from there.