I don't know all the functions the 10x10 can serve to be honest. I do know the balanced and unbalanced have two inputs and four outputs. But the unbalanced only has 0.9Vrms which makes it virtually a paper weight. I have read you can do a little jumper wire to increase that. I have also heard doing that little jumper can damage the unit. So that one was out for me...next was the unbalanced. Here you have to deal with Phoenix style connectors on the unit. A pro audio world connector. Anyway there are a couple cables out there and you can make the RCA to Phoenix for a few dollars. But I didn't want to have jimmy rigged little wires in my signal chain of thousands of dollars of equipment. So I went up to the open DRC AN after I learned a fellow AVS member N8dogg uses them in his 16 sub system. (He prob has a few). Now you only get two outputs with the open DRC AN but if you only have two subs what's the difference? If you got more you can always use a y connector and just make sure to have the subs on the same channel co located or equidistant to the MLP like on either side of a tv stand, or in the front corners, or on each side of the couch. Plus the open DRC has a better processor and XLR connections. I liked the secure ness of the connections.
The plugin is just a real basic user interface that you need to run your program on your computer. Each unit has it's own little plug I think