My son has a Onkyo HT-R391. This receiver has a passive sub. Uses One speaker wire 1 Positive ,1 Negative. I would like to upgrade his sub because I bought a new one. The sub I would like to add is a Energy 10.3 sub. I am not sure if I can do that and if so how I would wire it. Any thoughts? Thanks. Here is a pic of the Enery hookups
![Energy.PNG Energy.PNG](https://satguys.nyc3.cdn.digitaloceanspaces.com/data/attachments/86/86656-5afdca8298c287a8684ce383433b71d3.jpg)
![Energy.PNG Energy.PNG](https://satguys.nyc3.cdn.digitaloceanspaces.com/data/attachments/86/86656-5afdca8298c287a8684ce383433b71d3.jpg)