How do I install an in-line on my wireless subwoofer?

I have an Energy Power Bar(non-consumable) but not the sound bar[the controller] so I can't link my phone to it wireless. So I want to install a +L/+R/GRD cable to it. But I can't find anything on a service manual or information about the boards. I just want to bump some tunes through his thing and make it sound good. Can anyone help me make that happen? One of the boards appear to be the amp/volume control with the part number EX SB Sub Amp V11.