I have found that a solid core cable(AQ) sounds better than a stranded cable(Monster) for bass. Synergistic research Design also makes great but $$$$ sub cables.
True, Solid core types are very taut , accurate and dynamics. Among the choices for subwoofer cabling, there are very limited, but consider Audioquest or DNM.
see these cables employed from the home audio to car audio arena, and the definition is explosive, controlling the excursion of larger diameter speakers without loosing definition is a hard thing to do, but these cables play out well.
I am using the XLO Ultra on mine it did seem to add more voice. I had tried Monster and Audio Stream before. I asked Cardas, since I have a mostly Cardas system, and they said it really wasn't important due the frequencies involved. All I can say is I felt there was an improvement over the other two I had owned. You might give UsedCable.com a call and see if they have any in the lending library.