They might play OK together, maybe. I would measure the effects to be sure. The SVS sub would mostly only be good for shoring up dips in mid-bass in a system like that. It won't meaningfully contribute deep bass compared to the Outlaw. The problem is that the phase of the SVS subs will be in opposite phase of the Outlaw sub at port generated output. What model SVS sub is it? many of the newer ones have high pass filters that can avoid this phase conflict.