The picture looks like it's only showing speaker level out, and one phono type connector. So, will the be a preamp or will you have to use its internal amps? If that's the case, maybe the single phono I'm seeing is for subwoofer line level out for use with an external amp?
Guess one could go speaker level out...
Anyway, this is total here say based on not knowing what both sides of this thing looks like.